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  1. AnalogKid

    Carnival Game Control Board

    What is wrong with the system you have? What is it supposed to do? Photos of the "Carnival Game"? In general: Based on visual inspection, work up a system wiring diagram showing all interconnections among the boards, relays, etc. For each board, make up a complete BOM. This will give you...
  2. AnalogKid

    How to make this circuit unity gain?

    That is true for a conventional feedback network with both series and shunt elements. Without the shunt element the circuit becomes a voltage follower; non-inverting and unity gain, sorta like an emitter follower but without the DC shift. ak
  3. AnalogKid

    One wire light bulb?

    Yes, that is a small neon indicator for a control panel of some kind. Yes, it has a current limiting resistor built in. Yes, it will measure an infinite impedance unless the impedance tester imposes over 60-80 V across the leads. ak
  4. AnalogKid

    Open collector problem

    Nowhere in your post do you ask a question. I assume that the circuit is not working as you expected. ak
  5. AnalogKid

    What is this?

    LF also makes polyswitch or polyfuse devices, a thermal-acting self-resetting fuse-ish. Can you tell from the board tracks if it is in series or in parallel with stuff? ak
  6. AnalogKid

    Circuit boards on a aiwa stereo system

    These two boards over here, or those two boards over there? ak
  7. AnalogKid

    My electromagnetic pulse generator

    The US has non-nuclear EMP weapons. These were covered by Time Magazine the 90's, and Scientific American sometime before that. https://en.wikipedia.org/wiki/Electromagnetic_pulse#Non-nuclear_electromagnetic_pulse_(NNEMP)...
  8. AnalogKid

    Common Mode Noise Filter Question

    Your beliefs do not align with fact. It *never* is best to use individual coils. A high-performance AC powerline common mode filter *requires* that two identical inductors be wound on a single core made of something other than air. And how they are hooked up not only matters, it is critical...
  9. AnalogKid

    EEG CIRCUIT!!!

    This is not a very good circuit, and is not complete. The circuit is three stages of active filters, a gain stage that drives the output, and a final active filter stage that goes nowhere. His gain and phase plots show that significant amplitude and phase distortions will be added to the...
  10. AnalogKid

    Detecting an active low signal

    Yes, probably floating enough. The total pull up resistance is 48.8K. A pull down resistance of 220 K or more on your board should get you a logical low when the other board is removed, but not pull the reset line low when the board is connected. The higher the pull down resistance, the less...
  11. AnalogKid

    DC-DC converter 24-36 in, 40-60V out @ upto 40A.

    Don't confuse claimed efficiency for an extremely narrowly defined application with a generalized characteristic of the topology. You will *not* get that kind of efficiency in you application. Separate from that, the circuit is overly complex for the problem you have described. It's only...
  12. AnalogKid

    DIY voltage Regulator

    Agree. I never use ebay modules, both because I don't have to and because I've got a ton of parts to burn through. But I recommend them when my read of the TS situation seems to call for them. "Half the budget" is a trigger. Not knowing what an LDO is speaks to a certain level of experience...
  13. AnalogKid

    Electret Microphone Help

    With no part numbers, photos, links to product pages, or wiring diagrams, gee, what do you think? ak ps. AGAIN, Microphones do not produce data.
  14. AnalogKid

    What is up with this?

    The site won't let me add on, so here is something else. For a normal opamp the corner freq at which the pos and neg feedback loops balance is probably way too high for there to be any appreciable gain. However, if the opamp is a current feedback type, things make much more sense. ak
  15. AnalogKid

    10k trimmer

    As is shown on pages 4, 5, 6, 7, 8, and 9 of the datasheet, pin 3 is the fully-clockwise end of the resistance element. Pin 1 is the fully counter-clockwise end. Pin 2 is the wiper. This is the standard for trimpots. In your schematic, pin 3 goes to the 100 nF, pin 1 to GND, pin 2 to the 4.7...
  16. AnalogKid

    Electret Microphone Help

    That never will work with *any* normal microphone, especially electrets. An electret cartridge requires a cmall amount of DC for its operation. The signal output is a few millivolts (more if you yell), and cannot drive a voice-coil speaker directly. There are many low-cost amplifier modules...
  17. AnalogKid

    What is the name of this kind of connector?

    The generic term is wire-to-board. The part on the board is an unshrouded header. The part on the wire harness is a crimp-pin, pin-and-socket, or other names. AMP and Molex are huge in this market. The header usually is 0.1" pitch, with 2 mm as a close second. These are *not*...
  18. AnalogKid

    What is up with this?

    The source impedance driving the negative feedback is the Thevenin equivalent of the current boost stage inseries with the load, in paralle with 1 ohm. 1 ohm and 22 pF is a corner freq of 7-point-large GHz, so an active integrator probably is out. Looks more like compensation to prevent...
  19. AnalogKid

    What is up with this?

    App notes - From back when IC vendors sent their apps guys out on tour to promote their latest parts, 2 things. 1. App circuits, and particularly demo board circuits *and layouts*, were heavily tweaked to make the part look as good as possible, and *any* deviation from what was published was...
  20. AnalogKid

    Amplifier project

    So do I. While in high school in the 60's I inherited a complete collection of PE, with some intermittent RE and EW sprinkled in. Last year I found a magazine archive site with *everything*, including complete mag collections from the 30'3 and 40's. Love that old history stuff. Downloaded...
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