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  1. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Look 2 posts up from yours. He posted in the welcome thread (which presumably you did earlier)
  2. (*steve*)

    Cicuit board design

    First step is to design the circuit. Have you done that?
  3. (*steve*)

    Peak detector for piezo drum pad

    What do you mean? Especially about "maintain". Ideally (presumably) you would want the voltage to fall back down to 0 asap after reading the peak voltage.
  4. (*steve*)

    Peak detector for piezo drum pad

    Interesting. The circuit works fine with an Arduino. The problem can be that it is too sensitive.
  5. (*steve*)

    Peak detector for piezo drum pad

    This is the circuit I would recommend: C1 is the piezo element. The drawing tool I use for simple stuff I post here doesn't have a crystal symbol :-( R1 is used to limit the amplitude of the pulse. This has effects in both the positive and negative cycles from the piezo. For a positive...
  6. (*steve*)

    Peak detector for piezo drum pad

    What are you trying to do? The voltage on the piezo is going to be a rapidly decaying AC signal. Unloaded, it can be several 10s of volts -- easily enough to fry the inputs of sensitive circuits (your microcontroller and many op amps will count as sensitive). I presumed you were using the...
  7. (*steve*)

    Lock in amplifier EG & G 5210

    It would be very interesting to hear if there is confirmation that it was working previously. Even if it was, we couldn't rule out that it was around then that a tantalum capacitor decided to pay a may trick (not that I'm fixated on tantalum capacitors, but I've had to replace 4 faulty ones in...
  8. (*steve*)

    Realistic STA-2100D

    That part is likely to be almost pure unobtainium. What's wrong with it?
  9. (*steve*)

    Lock in amplifier EG & G 5210

    That board looks like the one which receives the input after it has passed through what I think is the preamp.
  10. (*steve*)

    Lock in amplifier EG & G 5210

    Please don't post in two separate threads. I'll delete your question and the reply in the other thread.
  11. (*steve*)

    Lock in amplifier EG & G 5210

    Was it working before you applied that large input? If so, you'll probably need to take a close look at the input circuitry. If it's a 5210, it will have the extra multiplier board held in place by two brackets which run across the case. There's 4 bolts to remove, and you'll have to...
  12. (*steve*)

    Peak detector for piezo drum pad

    The one in your first post (the one I replied to) There is a possibility that you are suffering from an issue which causes problems when the analogue inputs are used from high impedance sources. See this. Note is your turn to show a circuit diagram. If that is truely in parallel it meet be...
  13. (*steve*)

    Connecting ICs together without a mess (Eagle CAD)

    You could just show the pins connected to an on-sheet reference. A1, A2, ... And then you dont need to show the individual connections. Alternatively, if eagle supports it, there may be a bus wiring structure that shows the entire bus as a (typically thick) line, with the individual...
  14. (*steve*)

    Peak detector for piezo drum pad

    That circuit has 2 main problems. The first one of that the amplitude of the signal is strongly influenced by the value of the capacitor. The second is (frequently) is that you can end up with voltages that are way too high. BTW, my experience comes from helping a person get the electronics...
  15. (*steve*)

    My IC chip isn’t working properly

    Also remember that all cmos inputs net to be connected to a valid logic level. You can't leave them floating (disconnected).
  16. (*steve*)

    Explanation of a circuit

    At the very least, that circuit is incomplete ad won't do anything useful. Maybe the collector of the top transistor should be connected to +5V
  17. (*steve*)

    How does a decade counter IC 4017 works?

    the counter counts edges. The 4017 advances on the rising edge of a clock pulse. That means it counts up by 1 each time the logic level changes from a 0 to a 1 on the clock input. A pulse is the logic level changing from 0 to 1 and back to 0 (it can also be the reverse of this (1 to 0 to 1)...
  18. (*steve*)

    Identification: MOSFET IRF520 type

    That would be fine except they are not in stock :-) I didn't tell you how many results I got :-) The first voltage should be less than or equal to 5V. I think it's the first 5 entries from memory. Select from the first 8 to the last 100. It's not too critical though. You will probably...
  19. (*steve*)

    Identification: MOSFET IRF520 type

    Let me tell you that the diagram, while terrible, tells me enough :) I'll let you do the searching. Once you've done that, post a link to what you've decided and we can check it out. Go to http://Digikey.com In the search field enter "MOSFET" and hit enter. In the list of top results click on...
  20. (*steve*)

    Identification: MOSFET IRF520 type

    The IRF520 is a relatively old school MOSFET. It's rated for a maximum voltage of 100V, a maximum current of 10A, and has a channel resistance up to about 0.25Ω. As an old school device it also has a relatively low gate charge. My question for you is "what are these used for?" There are many...
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