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  1. 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 resistance to the audio. This amplifier will give excellent battery life, drawing only 500 uA. Below is a typical application using it with the first crystal radio circuit. The amplifier provides good volume with a modest antenna. You may want a volume control as with the TL431 project! Or use the Cry
  2. 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. 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 or HongKong post is pretty satisfying. Shipping fee is much cheaper. According to my experience,you can also get the free universal boards. Placing an order is simple. Type in the specification and upload the files, waiting for auditing! Then dont worry, there's someone contacting you if there's somethin
  4. 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/ http://www.sfcircuits.com http://expresspcb.com/ http://www.apcircuits.com/ http://www.10pcb.com/ http://www.goldphoenixpcb.com/ http://batchpcb.com/index.php/Products http://www.pad2pad.com/index.html http://www.pcbcart.com./ http://www.4pcb.com/ http://www.pcbfinpo.com/ http://www.sunstone.com/ http://www.pmsn
  5. 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. 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, PCBWay also can design diagram and gerber files and Bom lists for you.
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