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40m SSB receiver using LM373 in SSB mode. 500kHz IF with 3-pole ceramic resonator filter; 500kHz BFO.
NE602 mixer/oscillator and LM380 audio stage.
Bottom side of the HobbyKing HK-GT2R receiver (FlySky GT3B compatible).
The markings on the RF chip have been removed. The micro-controller has markings but a search has not yielded any results. It seems to be a ROM/PROM version as there are not programming pads, only test pads.
Traces of the circuit featuring a surface mounted device. As one can tell, the circuit was not planned perfectly. But a minor exacto-knife and wire surgery saved the board and all's well.
I got 4 PCB coasters several years ago in London. The National History Museum sold geeky stuff in their souvenir shop.
Zoom in ;-)
Rinsing off the photoresist
Related blog post: blog.gg8.se/wordpress/2008/12/19/pcb-manufacturing-at-my-...
Do you find yourself wishing that you had a new cool way to interact with Pmods that wasn't the same old system board or breadboard? How about a sweet PCB ruler?
With 3 different Pmod inputs, 8 buttons you can use with your fingers, and power tied all throughout the ruler, measuring distances will never be the same again.