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Hitachi PCB 0A53039 (PCB Swap, PCB Replacement, PCB Logic Board Sale, Buy PCB Circuit Board - HDDZone.com)
This PCB mounts under the incoming message deck. It contains the loudspeaker power amplifier (the transistors in heatsink clips on the right), the 'auto mode' switch, and the circuitry to detect tape motion, triggered by the reed switch in the top centre.
The auto-mode switch is operated by the linkage on the cassette mechanism that would have operated the record switch if it were just a simple cassette recorder.
This is a custom TQFP socket breakout board that I made specifically for programming chips before soldering them onto the board. This helps identify bad chips.
I also can breadboard the entire project before I make the board to ensure the schematic is correct.
My first crack at laying out Roger Gomes' headphone amplifier schematic…
Etching it now, and will test with spare parts (I'm saving the good components until the design is finished).
As the electronics hobbyist one of knowledge that we have to be familiar with is how to make our own printed circuit board (PCB). Making our own simple single side PCB actually is not require a sophisticated technique and technology as you might think, instead most of the required materials is already available at your home. For more information please visit www.ermicro.com/blog/?p=1526
As the electronics hobbyist one of knowledge that we have to be familiar with is how to make our own printed circuit board (PCB). Making our own simple single side PCB actually is not require a sophisticated technique and technology as you might think, instead most of the required materials is already available at your home. For more information please visit www.ermicro.com/blog/?p=1526
Thanks to a fellow GeekHack member, I was able to purchase a couple sets of PCB mounted Cherry Stabilizers.
Note the emoticon. a couple decades ago they'd have made a circular smiley face. Now it's a colon and a parenthesis.
The main PCB which mounts on the bottom of the chassis. The bias/erase oscillator transformer (centre) and relay bracket (bottom left) are unscrewed so I can investigate the wiring.
On the right are the D-series plugs to connect to the main chassis.
The transistor numbers on the PCB have been assigned to help the repairer (!) :
TR1-3 : Announcement Playback Amplifier
TR2x : Message Recording Amplifier
TR5x : Bias/Erase Oscillator
TR6x : Ring Detector
TR8x : Announcement Start
TR10x : End of Announcement
TR12x : End of Message
TR14x : Message Playback Amplifier
Jacqueline Patten, wife of Pacific Coast Branch founder, the late Jack Patten; and PCB Treasurer Gavin Cooper.
SuperPCB specializes in PCB fabrication including prototype and production circuit boards.TS16949, ISO9001 and UL certified. IPC Class II or IPC Class III. For more details visit our website.
This is the PCB for the Infinity keyboard, which was designed by Jacob Alexander (aka Haata) and produced by Massdrop.
This PCB supports two different layouts (standard and hacker) as well as Cherry MX and ALPS switches.
The black foam on the right of the shot is covering what I’m guessing is an expansion port. Not sure what the four prongs are for.