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Day 239: Found a new favorite store at the mall today. Albums, LaserDiscs and toys, oh my!
While there were some excellent LD's there, there were more VideoDiscs, or CED's. Unlike LaserDiscs, which used optial means to read the data, these were more like LP's or vinyl albums in that a stylus physically read the information from the disc. Arriving on the market too late and competeing with LD's in a niche market virtually doomed it from the start, as well as the inability to record to them.
I went through with one last batch of fuel tank sealant to address the areas that weren't behaving themselves during the last pressure tests. The black hexagon at the top here is the Aircraft Extras Fuel Guardian sensor. The brass thing beneath it is the Princeton Capacitance Fuel Level Probe.
One the left tank, I sealed the new bubbling corner leak as well as a bonus coat on the old leak just for good measure. On the right tank, I hit everything that failed the Kool-Aid test. The left tank needs a week to cure before I pump it up again to test it. The right tank is now ready for the aft baffle to be installed.
My refurbishment on this Revox A77 Mk1 circa 1969 is now complete. This was the more desirable high speed version (15 & 7.5 IPS). The old Tantalum capacitors replaced with modern electrolytics, old Rifa spark suppressors replaced along with all new trim pots and some high wattage resistors. New brakes and hubs fitted. Still running on the original hub motors and capacitance motor. I’ve treated it to brand new RMG LPR90 tape and performed a full recalibration. I may replace the heads in the future however they still have plenty of life left in them.
Behold, Bananeurysm's 808BD circuit board. One of my first synth-DIY projects. This is a clone of the legendary Roland 808 Bass Drum instrument in - t i n y - footprint. (that Moog pointer knob is about 1 1/4" in diameter)
Notice the "Japanese'ing" of the resistors in order to squeeze into the small package.
But powered, triggered, and connected to a good bass amp and this dynamo shakes the house. If you set the 'decay' pot all the way to the extreme and walk away, you stand the risk of stray capacitance causing a sonic rumble that decays indefinitely (aka does not decay at all!).
Coming soon... the 808 Snare.
This is my fuel level capacitance probe (I only have one for the time being, see below). This particular one has 3" of bendable area at the base and is 24" long overall. I put the necessary bends in it such that the drain hole is as low as possible in the tank, it will poke through the central hole in the second rib, and the tip will be as high in the tank as possible.
Due to Aircraft Spruce screwing up my order, I only received one fuel level probe, so I need to order another.
I had to add extra capacitance because at the size of the loop the calculator can't accurately model it and it would only tune the upper half of the AM band. I made two fixed capacitor settings to add in, 780 pF and 325 pF. The antenna covers the AM band in three parts, from about 550 to 780 kHz, 700 to 1100 kHz, and 1000 to 1700 kHz. I just pick the switch setting and then tune the antenna and it pulls in the stations.
Vishay’s new DSCC-approved SuperTan® 10004 wet tantalum capacitor offers the industry’s highest capacitance to 10,000 µF in the axial T1, T2, T3, and T4 case codes. (Click ALL SIZES for hi-res version.)
This series string of 150 capacitors runs down the center of the secondary coil, adding capacitance and lowering the resonant frequency.
Vishay’s new VJ series non-magnetic surface-mount MLCCs for MRI diagnostic equipment are available with both C0G (NPO) and X7R/X5R dielectrics, and feature 11 case sizes, voltage ratings from 6.3 VDC to 3,000 VDC, and capacitance values from 0.5 pF to 6.8 µF. (For hi-res version, select "View all sizes" from Actions pulldown menu above.)
My refurbishment on this Revox A77 Mk1 circa 1969 is now complete. This was the more desirable high speed version (15 & 7.5 IPS). The old Tantalum capacitors replaced with modern electrolytics, old Rifa spark suppressors replaced along with all new trim pots and some high wattage resistors. New brakes and hubs fitted. Still running on the original hub motors and capacitance motor. I’ve treated it to brand new RMG LPR90 tape and performed a full recalibration. I may replace the heads in the future however they still have plenty of life left in them.
High-Fidelity Bosc Interconnect Unleashes Performance
Based on the proven geometry of the Comice Silver Interconnect, the Bosc Interconnect enables high-fidelity sound at a more economical price.
Car audio interconnects directly affect the sound quality of any system. The Bosc Interconnect helps to minimize sonic damage by utilizing high-grade materials such as foamed Polyethylene and proven cable geometry borrowed from the Comice Silver Interconnect.
Get all of the sound quality out of the rest of your system with the Bosc Interconnect.
Low Capacitance
Foamed polyethylene “blanks” are twisted with foamed polyethylene insulated conductors to achieve a low capacitance interconnect. By keeping the capacitance low, musical details will be clearer, and listening fatigue is significantly reduced.
Pure Copper Signal Conductors
99.99% pure copper, annealed to prevent microcracking, for "audiophile-grade" signal transfer. Don't settle for sound degrading silver-plated copper. Pure copper conductors provide excellent signal transfer and the harmful silver/copper metal interface is eliminated.
Triple Noise Reduction with TRIBODead™
Three levels of noise reduction, including Pear Cable’s exclusive TRIBODead™ triboelectric noise killer.
TRIBODead™ conductive polymer layer dramatically reduces triboelectric noise generation. Pear Cable is the world's first company to bring this technology to car audio cables. Triboelectric charges are created when vibration causes two different materials to rub against each other in a cable. TRIBODead™ virtually eliminates this noise caused by vehicle vibration for a cleaner sound and lower overall noise floor.
Twisted Pair conductors help prevent EMI noise from getting into your sound system. Twisted pair conductors are essential for eliminating alternator whine.
Spiral Serve Shield. Radio Frequency Interference (RFI) rejection is accomplished with a spiral served copper shield, grounded at one end only. The metallic shield acting in conjunction with the TRIBODead™ layer offers 100% RFI coverage.
Portal - AudioShop ( Chandra )
Hotline : 08161956046, 021-70505183
e-mail : tjc_12@yahoo.com
Built with environmentally friendly materials, Vishay's MKP1848C metallized polypropylene film capacitor for DC-link applications combines the industry's widest capacitance range from 1 µF to 500 µF with voltage ratings from 500 V to 1,200 V and compact footprints down to 9 mm by 19 mm by 32 mm.
What should I do with this thing? I bought it for the yellow box it comes in. I don't know what it does, and I can't power it up to see if it works... because it wants 115v @ 400 CPS. Also, the power cord has a dual banana plug on the end.
Additionally, there's a listing of one of these on ebay for between 400 and 700 dollars. I might have to sell it and buy another cool box.
This was not sufficiently large to cause any significant damage - just some surface corrosion of the spacer board. This will get worse with time as the capacitor seals are obviously aged and deteriorated. The removed capacitor capacitance, equivalent series resistance (ESR) and leakage current all tested fine after removal.
This 3D stereographic photo is of the CardioMEMS device, an implantable pressure sensor that wirelessly measures pulmonary artery pressures without requiring any batteries. It is used for heart failure patients to monitor their hemodynamics and estimate their volume status. This aids in prophylactically adjusting diuretics and heart failure medications before a patient becomes symptomatic and has to present to a hospital for a heart failure exacerbation. Reducing hospitalizations and HF exacerbations would aim to reduce mortality and improve quality of life.
The device is pretty amazing as it is very small and works indefinitely without batteries. The main component is a 15mm x 3.4mm x 2mm rectangle with two nitinol wire loops on each side that extend the length of the device to 4.5cm. Nitinol is a metal alloy of nickel & titanium that exhibits shape memory and superelasticity. Nitinol is commonly used for stents and other medical devices as it is biocompatible and folds up nicely in a tiny catheter before being deployed in the body where it expands to its full size and shape. This anchors the device in the distal pulmonary artery.
Its theory of operation is exceedingly simple in terms of design. It consists of a three dimensional coil of wire and two metal plates on two wafers of fused silica encased in silicone. The coil is produced through electrodeposition of gold onto a silica wafer in a vacuum chamber. Fusion bonding is used to join the silica wafers. The coil of wire forms an inductor and the two metal plates act as a capacitor in physics & electronics terms. This arrangement connected in a parallel loop forms a resonant LC circuit (L=inductance, C=capacitance). Depending on the capacitance and inductance of the components, the circuit will oscillate at a perferred resonant frequency. The capacitor in the CardioMEMS is exposed and very thin allowing the silica crystal and metal plates to deform with changes in pressure from the blood within the pulmonary artery. Changing the distance between metal plates of a capacitor changes its capacitance value thereby changing the devices resonant frequency. An external machine can ping and excite the coil with various electromagnetic radio frequencies until it is able to find its resonant frequency. By working backwards, the measured frequency can be converted into an estimated capacitance which can be correlated to an estimated pressure measurement.
The device is placed during the right heart catheterization (RHC) procedure when the physician threads catheters from a patient's veins through the right atria, past the tricuspid valve, through the right ventricle, and finally past the pulmonary valve into the pulmonary artery. Fluoroscopy or video x-rays along with radiopaque contrast are used to visualize the blood vessels and guide the catheters to their destination. During the RHC, the cardiologist will use a Swan-Ganz catheter to measure the actual pressure and calibrate the device's measured pressures to actual pressures.
doi.org/10.1177/1753944719826826
This photo is in 3D parallel view. More Instructions for viewing 3D images: www.3dphoto.net/text/viewing/technique.html
Stereo Viewer for all my photos: jongames.com/stereophoto/
Perhaps a few of these arranged thoughtfully will make a flux capacitor? 1955, here I come!
One used to have to explain a capacitor a little more than a buffer.. A kind of little bucket you could use to store some charge in, but hardly useful for any serious storage. But when it comes to something anywhere near this kind of capacitance, forget that talk, this is like a decently massive battery that can be disturbingly quickly charged or discharged.
By the way, 200 Farads is EXTREMELY INSANE. This cap is like $25, but regardless, the guy who showed me this reminded me that 20 years ago, the claim was that you'd need enough capacitors to fill a house to get around 1F. So yeah, this is NUTS. This thing could source about 700W for a second (AKA: ~700J) - So two of them could run something insane like a hair drying or a solar car (for a second at full steam). Nutty.
Just an idea where spark should occur in the coaxial spark gap. It is uncertain where exactly will make spark, but housing itself provide additional capacitance for hotter plasma and low inductance.
All is fixed with only one screw/bolt or two screws/threaded tube (brass or copper).
Available in four heights from 160 mm to 265 mm and five diameters from 64 mm to 136 mm, Vishay’s new EMKP series of 3-phase cylindrical capacitors features high current capabilities up to 3 x 56 A and 3 x 104 A, nine standard voltage ratings from 400 VAC to 1650 VAC, and a wide range of capacitance values from 4.0 µF to 600 µF. (For hi-res version, select "View all sizes" from Actions pulldown menu above.)
#Power #Paper #stores #Electricity
A new kind of paper has the #extraordinary ability to store #energy.
Researchers at #Linkoping #University in #Sweden have developed a "Power Paper" that can store electricity. The material consists of Nano cellulose and a conductive polymer. It is light in weight, has no dangerous #chemicals or heavy metals and it is waterproof.
Single sheet of this new material is #15cm in #diameter and less than #0.5 millimeter thick, can store 1F (farad) of electrical #capacitance. The material can be recharged hundreds of times. It can be charged within few seconds. It looks and feels slightly like a plastic paper.
"Thin films that function as capacitors have existed for some time. What we have done is to produce the material in three dimensions. We can produce thick sheets," said study co-author professor #Xavier Crispin.
The new polymer material power paper has set a new world record, which explains its exceptional capacity for energy storage.
My refurbishment on this Revox A77 Mk1 circa 1969 is now complete. This was the more desirable high speed version (15 & 7.5 IPS). The old Tantalum capacitors replaced with modern electrolytics, old Rifa spark suppressors replaced along with all new trim pots and some high wattage resistors. New brakes and hubs fitted. Still running on the original hub motors and capacitance motor. I’ve treated it to brand new RMG LPR90 tape and performed a full recalibration. I may replace the heads in the future however they still have plenty of life left in them.
My refurbishment on this Revox A77 Mk1 circa 1969 is now complete. This was the more desirable high speed version (15 & 7.5 IPS). The old Tantalum capacitors replaced with modern electrolytics, old Rifa spark suppressors replaced along with all new trim pots and some high wattage resistors. New brakes and hubs fitted. Still running on the original hub motors and capacitance motor. I’ve treated it to brand new RMG LPR90 tape and performed a full recalibration. I may replace the heads in the future however they still have plenty of life left in them.
My refurbishment on this Revox A77 Mk1 circa 1969 is now complete. This was the more desirable high speed version (15 & 7.5 IPS). The old Tantalum capacitors replaced with modern electrolytics, old Rifa spark suppressors replaced along with all new trim pots and some high wattage resistors. New brakes and hubs fitted. Still running on the original hub motors and capacitance motor. I’ve treated it to brand new RMG LPR90 tape and performed a full recalibration. I may replace the heads in the future however they still have plenty of life left in them.
For military and aerospace applications, Vishay's new HE4 wet tantalum high-energy capacitor combines a low maximum ESR down to 0.025 Ω with ultra-high capacitance from 1100 µF to 72000 µF and a unique case design for improved reliability and performance.
PL1 towers showing a phase transposition.
In early overhead line practice, it was believed to be important to even out the electrical capacitance between the conductors and earth by changing their order every so often along a route. With single-circuit towers, this was achieved by having one tower in the opposite orientation to the rest. Over the course of two spans, the three conductors change places.
Oscilloscope screen-shot, displaying the following signals of the 74HC373 (U65) (see probe connections here):
• channel 1 - output enable
• channel 2 - latch enable
• channel 3 - D0 (latch input 1)
• channel 4 - Q0 (latch output 1)
Upon observing the shape of the edges, I realised that the capacitance of the oscilloscope probes was interfering with the quality of the measurements. To correct for this, I later switched each of them over to the 10x setting.
This is the faulty component in the left-hand channel: a 220uF capacitor that I measured on the multimeter at 17nF. The lack of capacitance made the regulator go into oscillation as the voltage was turned up. The top of the capacitor is slightly bulging, which is a sign of failure.
You can see the bad capacitances of the mainboard by zoom in it,there were 5 places has been signned out with a cursor each
RF High Frequency Power Ceramic Capacitor 5KV~30KV/100pf~6000pf
HV RF Disk / Plate ceramic capacitor, RF Barrel / Doorknob Capacitor, RF Feedthrough Capacitor, High Voltage Plate Ceramic Capacitor, High Power Ceramic Capacitor, HF power capacitor, High Frequency Ceramic capacitor
Manufacture Supply HF Power Plate Ceramic Capacitor
Rated Voltage (V): 5KV to 30KVDC
Capacitance Range: 100pF to 6000pF
Reactive Power: 30KVA to 150KVA
Application
High Frequency heating & TV broadcast power transmitting
High Voltage Broadcasting & Telecommunication
High frequency welded pipe, High frequency drying, High frequency electric oven,
Plastic thermal bonding machine and radio communication equipment
High Power Equipments
Water Cooling System, Power Distribution Systems, Electrical Control Panels, Power Factor Panel, Motor Control Panel, High Frequency Induction heating power systems
Rated Voltage: 5000V, 8000V, 10KV, 11KV, 12KV, 13KV, 14KV, 15KV, 20KV, 21KV, 25KV, 30KV,
Capacitance: 50pf, 100pf, 150pf, 200pf, 250pf, 300pf, 330pf, 350pf, 500pf, 600pf, 750pf, 1000pf, 1500pf, 1600pf, 2000pf, 2200pf, 2500pf, 3000pf, 4000pf, 5000pf, 6000pf
Power: 30kva, 40kva, 60kva, 65kva, 75kva, 90kva, 125kva, 150kva
Specification,
30kva: 5kv 100pf, 150pf, 200pf, 300pf
40kva: 5kv 330pf, 8kv 300pf, 330pf, 350pf
60kva: 10kv (300pf, 350pf, 500pf, 600pf), 12kv (300pf, 350pf), 15kv (100pf, 150pf, 200pf, 250pf, 300pf)
65kva: 10kv 750pf, 12kv 500pf
75kva: 8kv 1000pf, 10kv (500pf, 1000pf), 12kv (300pf, 350pf), 13kv (500pf, 1000pf), 15kv (300pf, 350pf, 500pf)
90kva: 10kv (1000pf, 1500pf), 11kv 1600pf, 12kv (1000pf, 1500pf), 14kv (500pf, 600pf), 15kv (500pf, 1000pf, 1500pf), 20kv (300pf, 500pf), 25kv (300pf, 500pf), 30kv (300pf, 500pf)
125kva: 10kv 2500pf, 12kv (2000pf, 2500pf, 3000pf), 13kv 2000pf, 14kv 1600pf, 15kv (1000pf, 1500pf, 2000pf, 2200pf), 21kv (1000pf, 1500pf, 2000pf), 25kv (1000pf, 1500pf), 30kv (500pf, 1000pf)
150kva: 12kv 6000pf, 13kv (4000pf, 5000pf), 15kv (2000pf, 2500pf, 3000pf), 20kv (2000pf, 2500pf), 30kv (1000pf, 1500pf, 1600pf)
Original circuit with capacitor change. Effect on timing section.
From 10uF to 220uF (first part of video)
Then 4.7uf (second part of video)
This represents 22times increase and approx. half of the original value.
Vishay’s new MKP1847 metallized AC polypropylene film capacitor features a wide capacitance range from 1 µF to 70 µF, voltage ratings from 230 V to 350 V (with a 440 V version under development), and a long life of > 60,000 hours. (For hi-res version, select "View all sizes" from Actions pulldown menu above.)
5000pf Water Cooled Ceramic Capacitor
Manufacturer Supply 25KV 5000pf 2000Kva Water Cool Ceramic capacitor
High Frequency RF ceramic capacitor, Watercooled power RF capacitor, RF pot capacitor, water cool capacitor
Specifications:
Rated Voltage (V): 10KV to 30KVDC
Capacitance Range: 500pF to 6000pF
Reactive Power: 1000KVA to 3000KVA
Application
High Frequency heating & TV broadcast power transmitting
High Voltage Broadcasting & Telecommunication
High frequency welded pipe, High frequency drying, High frequency electric oven,
Plastic thermal bonding machine and radio communication equipment
High Power Equipments
Water Cooling System, Power Distribution Systems, Electrical Control Panels, Power Factor Panel, Motor Control Panel, High Frequency Induction heating power systems
RF induction & dielectric heating equipments. Mianly for bypass, feedback & coupling circuits
Rated Voltage: 5000V, 8000V, 10KV, 11KV, 12KV, 13KV, 14KV, 15KV, 20KV, 21KV, 25KV, 30KV,
Capacitance: 500pf, 600pf, 750pf, 1000pf, 1500pf, 1600pf, 2000pf, 2200pf, 2500pf, 3000pf, 4000pf, 5000pf, 6000pf
Power: 1000Kva, 1275Kva, 1500Kva, 2000Kva, 2500Kva, 2830Kva, 3000Kva, 3500Kva
Specification,
12kv: 1275kva 5000pf
14kv: 1000kva 1500pf, 1500kva (2000pf, 2200pf, 2500pf), 2000kva (4000pf, 5000pf)
16kv: 2500kva 4000pf, 2830kva (5000pf, 6000pf)
20kv: 2000kva (600pf, 1000pf, 2000pf, 3000pf), 3000kva (5000pf, 6000pf)
24kv: 3000kva (4000pf, 5000pf)
25kv: 2000kva 5000pf, 2500kva 2500pf
30kv: 5000pf 3500Kva
Key Words,
30KV 3000pf Water Cooled Ceramic Capacitor, High Power Water cooled Capacitor, High Frequency Water cooled Capacitor, 20kv Water Cooled Ceramic Capacitor, 15KV water cool power ceramic capacitor, HV Water cooled Ceramic Capacitor
The PmodCDC1 is a capacitive sensor that uses the Analog Devices AD7156. By communicating with the chip via I2C, users can set the Pmod for an adaptive capacitance threshold that changes with the environment or set static thresholds that only trigger when a certain capacitance is reached.
Innards of the 360 flash. The batteries are gettable, but a replacement cap may be hard to source. Have yet to really look. Though the capacitance is good, it seems to be very leaky... won't charge above 100V with fresh batteries.
Hydroelectric power plant in Aswan dam (Egypt). This plant produces over 70% of the electricity for all of Egypt.
The monitors with their butts ripped off... View corresponding blog post at www.pushtheotherbutton.com
I find the stock "float" style fuel level sensor that Van's recommends to be inelegant, so I'm going to install some capacitance probes instead. The only problem is that the sensing part of the probe needs to be straight, and with the slosh baffles in place there aren't a lot of good places to run one. This is the best solution I came up with, just forward of the lowest point in the tank to the top aft corner of the second bay. This should give me about 5 phantom gallons at the high end and probably less than one at the low end. I've placed an order for the 24" probes and we'll see how they work.