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  1. AnalogKid

    Electric curtain project: single Push button design

    Is your project limited to all relays and wires, or can you work with IC's, transistors, etc? ak
  2. AnalogKid

    Diode usage_single or individual per connection needed

    Without connection dots on the schematic and more information about the signals involved (voltage range, current, inductive load, etc.) it is almost impossible to say. For example why is the signal on pin 10 labeled just like the ones on 2, 4, 6, and 8, but connected differently? ak
  3. AnalogKid

    How to connect op amps in parallel

    The classic National Semiconductor app note circuit used a strange semi-resonant transformer that was available through distribution for a while. Both AM and FM "wireless" intercoms used some variation of it. ak
  4. AnalogKid

    How to connect op amps in parallel

    Is that stereotyping?
  5. AnalogKid

    How to connect op amps in parallel

    Actually, I think my response was very helpful. It was carefully crafted to encapsulate all of the technical requirement in post #1. ak
  6. AnalogKid

    How to connect op amps in parallel

    Yes. ak
  7. AnalogKid

    Super Simple Circuit questions

    Other than flipping everything over to an N-channel FET (lower Rdson per $), Ken's circuit is exactly what I had in mind. Also, a 9 V battery significantly increases the number of MOSFETs to choose from. ak
  8. AnalogKid

    Super Simple Circuit questions

    What is the project? How many units? How many LEDs? How Bright? Battery type, size, etc? Size limit? Cost limit? How accurate must the 3 minute interval be? Important: Do the LEDs have to turn off crisply, or can they fade away over 5 to 30 seconds? Depending on the answers, this could reduce...
  9. AnalogKid

    Could you guys help identify some things?

    Shure - classic audio mixer. Some audiophiles (spelled "crazies") still treasure them for their "sound". Worth something on ebay. Radio Shack video color processor - used to clean up the ratty-looking video that came from older VCR's. Each oscilloscope will have a manufacturer and model...
  10. AnalogKid

    Is the microphone input on a mixer a normally closed circuit?

    Should not be a problem, especially if the mixer is not providing phantom power. ak
  11. AnalogKid

    New Product Prototype

    It is a radio receiver. Since it doesn't know when you might press the button, the receiver is on and active all of the time. The output switch probably is a small power MOSFET, and consumes almost nothing between activations. ak
  12. AnalogKid

    Please Help Me Assemble 10m Remote Ultrasonic Compact Circuit

    Ultrasonic proximity alarm, scaled up for 10 meter distance. ak
  13. AnalogKid

    New Product Prototype

    Without more details about the circuit and components, it really is impossible to say. If it is just a battery, button, and buzzer, there should be zero current when the button is not pressed. What else is on the relay pcb besides the relay? Schematic? ak
  14. AnalogKid

    Is the microphone input on a mixer a normally closed circuit?

    What do you mean by "normally closed"? That usually is a term related to relay and switch contacts. If you mean - is the input to a mixer shorted to ground when nothing is plugged in, the answer is maybe but probably not, and it depends on the input connector type. What mixer? Any particular...
  15. AnalogKid

    DC Wall Adapter...

    If you are talking about a linear power supply (as opposed to a switching supply), an 800 W transformer weighs over 10 pounds and is larger than a softball. There is no way to modify a smaller transformer, because the total power you can move through a transformer is set by the physical size of...
  16. AnalogKid

    small power supplies

    The photo shows two wires, but that could be artistic license. The connector has 8 pins. ak
  17. AnalogKid

    small power supplies

    The 5 V input power option is an expensive problem. That requires a DC-to-AC inverter. Even at a low power level of 1.5 W, that is not a trivial design. Does the AC have to be a sinewave, or can it be a square wave? What does it power? ak
  18. AnalogKid

    What's wrong with circuit?

    No, he isn't. A 1N4007 diode is rated for 1000 V PRRV, peak repetitive reverse voltage. It is NOT NOT NOT a zener diode of any kind. That advice is so bizarre, it reduces the rest of your posts to somewhere between useless and dangerous. In a circuit like this that has no external earth...
  19. AnalogKid

    How to change LED flashing?

    Many LED flashlights now use custom chips designed specifically for the application. All random logic design, no microcode, often with a small power MOSFET onboard. ak
  20. AnalogKid

    How to change LED flashing?

    The blinking is almost certainly controlled by a microprocessor. The only way to change its frequency is to reprogram it. ak
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