Recent content by Elcpoppy

  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

    4. http://expresspcb.com/ The Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional. 
  3. Elcpoppy

    PCB manufacturing sites - work in progress

    I think I can add more comparing information here for reference. 1. PCBWay pcb prototype company A manufacturer that specialized in PCB industry. $5 cut for the first order. If you need long-term purchasing, they provide more coupons. More customization choices vs itead. Delivery time with DHL...
  4. 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/...
  5. 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.
  6. Elcpoppy

    PCB manufactureres

    For PCB prototype and copy pcb, I strongly recommend pcbway(http://www.pcbway.com/q  ).I have bought 5 pcs single sided pcbs from them with $17. As there's $5 discount, the total price is $13. The boards are pretty good with high quality. I revceived them within 5 days. If you have boards...
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