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  1. Elcpoppy

    Crystal Earphone Amplifier

    This simple, one-transistor amplifier provides a voltage gain over 1000 (60 dB) for driving a high impedance ceramic (crystal) earphone. The high gain is achieved by replacing the traditional collector resistor with an unusual constant-current diode that supplies 1/2 mA yet exhibits a very high...
  2. Elcpoppy

    PCB manufacturing sites - work in progress

    This is a question always been asked so I try to make this list to cover as many pcb manufacturers as I can. This is a listing of websites making PCBs and  also may including PCBAs. I will try to update the infomation now and then. http://www.pcbway.com/ -$5!!! http://www.pcbgeek.com/...
  3. Elcpoppy

    Cheap OLED Displays and Arduino

    Project with Arduino to share... I have tried to make a similar one befire, but it failed. Hope this article helps you like it helps me.
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