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  1. AnalogKid

    Frequency generator, level adjust

    There is a link to a power supply project near the top of the page. Looking at the oscillator circuit, I would guess it would run on voltages as low as +/-12 V. The attenuator will run on lower voltages such as +/-9 V, but the oscillator might start to clip. ak
  2. AnalogKid

    Frequency generator, level adjust

    In the ESP project page, both the oscillator and the attenuator are powered with +Ve, -Ve, and GND, so I don't understand your question. The attenuator circuit is a unity-gain buffer driving a resistor divider. The buffer (Q1, Q2, etc.) can be replaced with an opamp in the voltage follower...
  3. AnalogKid

    LM358 Replacement

    Correct, but that is not what he said. So, incorrect. ak
  4. AnalogKid

    Capacitor Number clarification

    In some European languages and technical writing, the decimal point is replaced by a comma. ak
  5. AnalogKid

    12 volt delay timer

    My HP-35 (real) says 57.29577950. God has spoken. ak
  6. AnalogKid

    AV Receiver Pioneer SX-217

    1. When it turns on, is it distorted? Also, is its volume approx. the same as the other channel? 2. After it comes on, does it stay on when you turn down the volume? If it does, is it distorted or out of balance? ak
  7. AnalogKid

    AV Receiver Pioneer SX-217

    The STK412 is a dual, 150 W/channel audio power amplifier hybrid module. You have two of them, for the two main channels and the two surround channels. Of those four outputs, which ones are behaving correctly and which ones are not? Also, are the sub woofer and other outputs behaving...
  8. AnalogKid

    AV Receiver Pioneer SX-217

    None of the links in post #4 work. Also, we need photos of the inside of the unit. ak
  9. AnalogKid

    I've been out of this too long...

    120 W might be enough, but it seems light to me. If I understand you correctly, you want one alternate-action function (power latch on and power latch off with one button) and two momentary functions. Yes / No? There are a ton of wireless remote control modules on ebay, many with relays as...
  10. AnalogKid

    Vacuum Tube Clock

    You can get one binary flipflop out of a dual triode. A four digit (hours and minutes) clock needs a minimum of 13 flipflops, plus more tubes for carry-gating, plus more tubes for some kind of time-setting capability, plus more tubes for display decoding. People have built digital clocks using...
  11. AnalogKid

    Capacitor between collector and emitter help

    This thread ended over 4 years ago. If there is something you want to discuss, you should start your own thread. You can reference this one with a link in your first post. ak
  12. AnalogKid

    Transistor as a switch

    Bottom line - Bell's lawyers screwed up. In the original 1953 patent there are 10 claims. The word "pair" appears a total of ten times in four of the claims. Nowhere does it say something like "two or more". If it had, Bell would have had the first patent for an "integrated circuit" six...
  13. AnalogKid

    Problem with Ramp signal Generator using IC 555

    Alec: The problem is not Vbe; it is hfe. If you run the numbers assuming a transistor gain of 50, it almost perfectly explains why the sim voltage at the R1-R2 node differs from the Thevenin equivalent by around 1 V. That is 10 uA through 100 K. TS: Where did that equation come from? Also...
  14. AnalogKid

    Problem with Ramp signal Generator using IC 555

    The Thevenin equivalent resistance of R1 and R2 is 31 K. That is a pretty high base resistance, so the voltage at the Q1 base will not be very "stiff". That is, it will change as the collector voltage ramps up. As the collector-emitter voltage changes, the transistor gain changes, so its base...
  15. AnalogKid

    12 volt delay timer

    I almost said something about fishing around on ebay for a timer module. $10 and free shipping - that is sick. ak
  16. AnalogKid

    12 volt delay timer

    Sounds like you need a circuit or device that is powered directly from the battery, so the timer has operating power when the vehicle is off, and feeds battery power to the cooler through a controlled switch. If so, what are the specs for the cooler? Min and max voltage, and max current? 30...
  17. AnalogKid

    Generating 24VAC Output (2 Amp Capability) from 36-40VDC

    To be clear, a 24 Vac sine wave power source is 24 Vrms, or 34 Vp, or 68 Vp-p. An equivalent square wave would be +/-24 V, or 48 Vp-p. - - - I am absolutely *not* picking on the TS, just observing: Once again, a young power system designer has independently discovered that a true sine wave...
  18. AnalogKid

    capacitor replacement help

    Yes. No. ak
  19. AnalogKid

    Transistor as a switch

    It turns on or off based on a combination of the base current (current moving into the base and out the emitter) and the base voltage - more correctly, the voltage across the base-emitter junction. The datasheet has tables and charts showing the relationships. The base-emitter junctions acts...
  20. AnalogKid

    Which Phoenix connectors? (nooby question)

    You are right - there are *tons* of different connectors out there. The term "Phoenix" helps, but not enough. To help us narrow down things, please post an example image of what you are considering. ak
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