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by Doug Kline
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Design Exibition, Villa Sartirana, Giussano (MI) Italy, Mar 24-Apr 29, 2009
Bello scoprire 30 anni dopo che il gioco sul quale hai imparato cosa sia il multivibratore bistabile (il Flip-Flop, insomma) oggi e' considerato un oggetto di design...
The Indianapolis Motor Speedway played host to more than 130 United Way Tocqueville Society members at the famed pagoda, May 2. Guests were treated to a hot lap around the oval as well as wonderful food and a special photo opportunity with the Borg-Warner trophy. Photography by Jennifer Driscoll (photosbyjennifer.com/)
Please note that a new hardware version of this device has been released, therefore these images will most likely not apply to it.
I've marked the spots where the traces were measured. The capacitor C26 (top right op-amp) seems to be the offending one, making the over-current regulation slow to kick in.
Traces: output voltage (yellow), output current (blue), over-current signal (green), combined voltage/over-current control signal (red) going to the power transistor drivers.
If you can provide further explanation, please comment!
Mrs. W. is taking a yoga class and they're doing breathing exercises. One of these is the "breath of fire" which involves rapid breaths, five every 2 seconds.
Just for grins, I'm building a little LED blinker circuit which blinks at that rate so that she can breathe along with it! And it will be relatively portable.
Based on an ATTiny84 microcontroller, which is absurdly overpowered for such a task, but I had some lying around and using one allows the circuit to be reprogrammed to allow for different blink rates selected by the push-button. Currently the circuit does the 2.5-per-second blinks or 1 per second.
The final product will be housed in the Altoids tin shown and powered by 4 rechargeable AAs. That is, again, overkill, but I had them lying around.
The switches in the bag are a kind I remember buying at Radio Shack around 1980, and I was hoping that my favorite electronics joint had something like them. As luck had it, they had exactly them! A small but noticeable chunk of Ra-Elco's stock is Radio Shack stuff that I guess was left behind when one of those closed up about 25 years ago. Maybe it was the one in Ogden where I bought the swicths I bought long ago - that one disappeared around then!
In fact, one such swicth was the FIRE device for Tank Battle.
Only one LED segment is hooked up to the driver chip. The Arduino microcontroller is making it flash on & off.
Three Tektronix 7B8x time-base plugins. Top and bottom are 7B80 (bottom has option-02) and the middle is a 7B85. Based on inspection of the schematics and the actual boards, it looks like upgrading a 7B80 to 7B85 would be fairly straightforward.
The circuit diagram for the solar-powered night light I made recently. Thanks to www.evilmadscientist.com et. al.
Some notes about the components.
D1 is a generic signal diode, which prevents the capacitor from discharging through the solar cell. I use some re-cycled parts in my projects - this came from a faulty power supply.
T1 is a PNP transistor, the type isn't critical. They are less common than the NPN types.
The 100R resistor limits the current to the joule thief.
T2 is an NPN type transistor, again it is not critical which you use. I've found most compact fluorescent lamps have at least one NPN transistor which can be harvested after the lamp fails.
The inductor needs to be hand-made, the ferrite ring also came from an old CFL.
D2 is a white LED.
I managed a stall showing off the Raspberry Pi, Arduino and Shrimping kits to the teachers, students and general public.
Panasonic's 1976 boom box. "You know I can't live without my radio!!". Hip Hop culture got a jump start from it.
Verizon had this remote-controlled robot assistant thing roaming around their booth. The lady on the screen controlling it and speaking through it was sitting in Boston, thousands of miles from Vegas. She/it walked right up to us and asked if we had any questions. I just kept wondering: "is it possible to kick this thing over?"
The chip in this watch has no conformal coating of any sort. If you wanted to, you could grab those little bonding wires.
Shot through the eyepiece of a stereo microscope. Note the date on the chip- it's from 1975.
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