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  1. (*steve*)

    Peak detector for piezo drum pad

    And... If you read a value, you will need to read it a few more times too make sure you have the peak value. If the first read happens during the initial rise you will have misread how hard it was struck.
  2. (*steve*)

    Determining The Accuracy of Amp Meter

    No, a single resistor is all you need.
  3. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    Your soldering iron needs to be placed so that it heats both the pad and the wire. After a second or so, feed a little solder into the joint so that it flows over the pad and the wire. Remove the solder and the iron. The joint should be smooth and be a concave meniscus joining the pad and the...
  4. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    The solder joints look like balls on top of the pads rather than smooth solder joints. They look like the pads were insufficiently heated and the solder did not flow over them. It only takes one bad joint to stop the circuit working, I suspect you have some.
  5. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    Aaaah, that's a better image. It appears that your solder joints are very poor. You need to Google for how to solder and go over each joint and fix them.
  6. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    Cut them off shorter
  7. (*steve*)

    555 or one shot

    I hope you didn't power this from your car battery with the engine running did you? Or maybe, even just once, maybe just for an instant, connect it up to the battery the wrong way around?
  8. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    What part of "trim the leads" did you think meant "add more solder"?
  9. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    There is a lot of motion blur in those photos, so they aren't really useful. What I can see is that you seem to have filled leads over before soldering them, and have failed to trim them properly. I recommend that you trim the leads, and then take photos where the light is better, or find a...
  10. (*steve*)

    Determining The Accuracy of Amp Meter

    Another approach, is you have a knows good ammeter is to place both in series while you do the resistor and power supply trick. If they read close to the same then they as as accurate as each other.
  11. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    You need to take photos we can use. Have a look here for information on taking good photographs. You're probably also going to have to note the part numbers of components (like transistors) where we won't be able to see them on your photo.
  12. (*steve*)

    Lock in amplifier EG & G 5210

    It could possibly help. I can't remember if it's soldered in. If it's in a socket and you have another processor, sure you can give it a go. The processor isn't programmed the way microcontrollers are. The program will be in eproms somewhere else on the board.
  13. (*steve*)

    Control the dc motor 40A controller

    Yes, that's exactly what you use. Then you filter it to get a DC voltage proportional to duty cycle. Google "Arduino pwm analog voltage"
  14. (*steve*)

    Lock in amplifier EG & G 5210

    Well, let's see what we can do.
  15. (*steve*)

    Lock in amplifier EG & G 5210

    I haven't looked at this unit in as much detail as my other lock-in amplifier, but I presume that the microcontroller is heavily involved in handling the reading of the buttons and the control of the indicator lights. The problem really comes down to isolating where the faults are, one by one...
  16. (*steve*)

    Lock in amplifier EG & G 5210

    Are the boards still removed?
  17. (*steve*)

    Lock in amplifier EG & G 5210

    15V or 18V on pin 8?
  18. (*steve*)

    Control the dc motor 40A controller

    You might be able to use an analogy output from the Arduino (suitably filtered) as a replacement for the pot of it is just a variable voltage divider.
  19. (*steve*)

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    Wow, that's helpful.
  20. (*steve*)

    Cicuit board design

    Ok. I presume you mean 18650 batteries. When you said lithium iron, did you mean LiFePO4, or lithium ion? Or don't you actually care? If you already have the batteries it will make a difference. Your phone may require around 10Wh to charge it. A single high quality lithium ion 18650 cell...
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