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  1. AnalogKid

    Traverse locking chime

    The chime could have been a custom feature of the original radio, triggered by an external signal from the lock control. A chevy dealer should know, or know how to find out. ak
  2. AnalogKid

    circuit explanation

    https://en.wikipedia.org/wiki/Charge_pump There are several different "standard" configurations. See the "See also" section for links. ak
  3. AnalogKid

    Class AB Power Amplifier Design

    Nope. What you say is true only if there is no input signal or the input signal is passing through Vcc/2 V. As the input signal changes, it drives the bias string moves up and down, and thus the output. ak
  4. AnalogKid

    Need help to describe a circuit

    A relay to select AC or DC input coupling An input attenuator string with a multiplexer IC acting as an electronic rotary switch A gain stage A -1.1 V converter A PIC uC acting as a digitizer, display formatter, and USB interface driver A Cockroft-Walton charge pump converting +5 V to -5 V A 3.3...
  5. AnalogKid

    LED connected though a SSR - Help.

    It sounds like there is leakage current through the SSR, but without a wiring diagram of your setup it is impossible to say for sure. ak
  6. AnalogKid

    Partialy Discharging Capacitor

    For a standard low cost flash, almost 100% of the capacitor energy is dumped into the flash tube every time. An SCR switching device works well for this because it is both a switch and a latch. It stays in the on state until the cap voltage is so low that the tube extinguishes itself and...
  7. AnalogKid

    Need help understanding data sheets

    A datasheet for a capacitor and a datasheet for an opamp are two very different things. What kinds of components are you interested in? ak
  8. AnalogKid

    Voltage dropping in resistor

    That is not the way I read posts #1 and #3. He's asking about charge balancing and electron movement, and in that context his statement about no voltage difference between A and B is incorrect. He knew it was incorrect, but didn't know why, which is the question he was asking. Given his...
  9. AnalogKid

    Voltage dropping in resistor

    Yes, there is. There is nothing wrong with your theory or logic, except that your conclusion is based on false data. Do not confuse what you can see or measure with what is real. Assuming none of your wires are superconductors, then each connecting wire has resistance of its own, and there...
  10. AnalogKid

    Automatic switching between parallel and series connection

    It doesn't. The water analogy for electricity is a simple one, works mostly for simple DC circuits only, and doesn't come close to addressing the complex vector analysis that is at the heart of AC circuits. https://en.wikipedia.org/wiki/Poynting_vector ak
  11. AnalogKid

    Automatic switching between parallel and series connection

    0 for 2. The analogy for voltage is pressure, water pressure. The analogy for resistance is restriction, the diameter of the pipe. The analogy for current is - current. Water flow in gallons per hour is the analog of electron flow in electrons per second. When you get down into the real math...
  12. AnalogKid

    Timer for a toy car

    The capacitor across the motor terminals is probably there for noise control. Without something more to go on there is no advice. Photos of the guts would help, as would any text or markings on integrated circuits. ak
  13. AnalogKid

    Wo is making this 12 pin connector for Volvo (PBT Gt15)

    Many automotive connectors are custom designed and built for one specific auto company. Even if you found the manufacturer, they probably are not allowed to sell it to the general public. ak
  14. AnalogKid

    Automatic switching between parallel and series connection

    A TEC has a relatively high output impedance, effectively a resistance in series with the voltage source. A discharged capacitor is presents a very low equivalent resistance to a DC voltage source, so the cap is basically "shorting out" the TEC output, and charging is based on the current...
  15. AnalogKid

    Cockroft-Walton Voltage multiplier

    That is a switching power supply. Assuming its output is square wave or sine wave AC, you will need extremely fast rectifier diodes. ak
  16. AnalogKid

    Piezo Preamp EQ

    A better plan is to have IC1A be the variable gain stage only, and IC1B be the equalization only. In this way the tone controls will have constant source and destination impedances, which will lead to much more consistent effects. It usually is better to put the gain stage ahead of the...
  17. AnalogKid

    Frequency Generation Without An Oscillator Ckt:multisim Simulation

    By definition, a frequency is not DC. The function of any oscillator circuit is to turn DC into AC of some form. ak
  18. AnalogKid

    Circuit help

    Nope. R1 is in series with D2 to limit the current through it. Since we tend to think of things (including electrical energy) as moving from top to bottom and left to right, go back to your schematic in post #7. The right side of it is correct, and the left side might be. It is only the...
  19. AnalogKid

    What Is This?

    No one can suggest a replacement without either the markings on the part of a complete schematic. ak
  20. AnalogKid

    What Is This?

    That is a diode missing one lead. What are all of the little letters and numbers? ak
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