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  1. (*steve*)

    Peak detector for piezo drum pad

    What's the gain bandwidth product of the CA3140 compared with the MCP6001? Is the difference significant? Is there an equivalent to the MCP6004 for the CA3140? What do the datasheets say? And of course, what are you actually trying to do? Because your initial statement you wanted a peak and...
  2. (*steve*)

    HA13150A Audio Amplifier

    If you don't need the features, tie both inputs to +5V. Standby puts the amplifier module into a low power mode (effectively turns it off).
  3. (*steve*)

    Realistic STA-2100D

    That's pretty much what you expect to happen.
  4. (*steve*)

    Simple LCD - help needed plz

    The MC96F6432 is a microcontroller with the capability to directly drive LCD displays. This makes your task somewhat more difficult. Can you find another of these "small consumer devices" that is faulty, but with an intact LCD display?
  5. (*steve*)

    HA13150A Audio Amplifier

    They are both inputs. Page 8 has an example of how to use the mute input. I imagine you could do something similar for the standby input. Do you want to use either feature?
  6. (*steve*)

    Lock in amplifier EG & G 5210

    You were checking pins 4 and 8, correct? (Pins 2 and 3 are not the supply connections)
  7. (*steve*)

    Trying to buy an underwater Infrasonic magnetostrictive transducer

    Other than anything living in that body of water.
  8. (*steve*)

    Peak detector for piezo drum pad

    Let me give you a quick rundown of that datasheet. This bit in the top left corner tells you who made this datasheet and who makes this op-amp. That might be pretty obvious, but the same op-amp may be produced by several manufacturers. Sometimes they're exactly the same, sometimes they're...
  9. (*steve*)

    Oscilloscope Question

    Is it also possible that the input to the scope is set to AC coupled causing the trace to centre itself around 0?
  10. (*steve*)

    Trying to buy an underwater Infrasonic magnetostrictive transducer

    I'd love to read the ethics section of your research project!
  11. (*steve*)

    Peak detector for piezo drum pad

    You're right. He just scolded you and he offered no suggestion. However, his suggestion that you look at the datasheet is a reasonable one. The simplest parts will tell you the minimum operating voltages, and only slightly more complex is the input and output voltage swing. Members of this...
  12. (*steve*)

    Cicuit board design

    Ok then you need to design a circuit first. A PCB is only designed after you have the circuit. Do you know: The amount of energy you wish to store in a full charge, The battery voltage (effectively defined by the number of cells in series), Your maximum load current, and Details of the solar...
  13. (*steve*)

    Lock in amplifier EG & G 5210

    Oooh, that's interesting. Take a look at more of those ICs. It may be worth putting the large shielded board back in and check some of the op amps on it too. I might take a closer look at mine to see if there are other regulators.
  14. (*steve*)

    radar.bob -

    Welcome @radar.bob
  15. (*steve*)

    Lock in amplifier EG & G 5210

    That indicates a current draw of 100mA on each of the +/-18V rails. That's reasonable. I'd move on to checking the voltages on the chips in the orange rectangle.
  16. (*steve*)

    Lock in amplifier EG & G 5210

    And a few questions you can answer for me. Is there a date of manufacture inside the lid of your unit? Does your transformer seem to sit nicely at right angles to the side of the unit, or does it sag down a bit? Did your unit have a piece of paper taped to the top of the large aluminium shield?
  17. (*steve*)

    Lock in amplifier EG & G 5210

    There are ways around the lack of a clamp multimeter, and the absence of a smell is good :) Do all these tests with the boards removed and disconnected. I've highlighted a few spots on the motherboard for you to check. Look at the part circled in red. A close-up should look a bit like...
  18. (*steve*)

    Lock in amplifier EG & G 5210

    I am very relieved :-) I have purchased equipment that has been gutted. It doesn't make me happy.
  19. (*steve*)

    Lock in amplifier EG & G 5210

    Ok, I'll assume you followed my instructions for removing boards to get at the input amplifier. If the buttons don't have any effect, then you have broader problems. My first check would be the power supply. Do you have a multimeter, and how confident are you in its use? Do you have access...
  20. (*steve*)

    Lock in amplifier EG & G 5210

    I presume you've removed 2 boards from the unit already? If not, then I have some very bad news for you.
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