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  1. crutschow

    Need a little help understanding the way my class AB power amplifier works.

    That's a difficult question as it depends greatly on your ability to develop an understanding of basic analog electronics. I have a BS in Electrical Engineering and retired from doing circuit design work in the industry after over 40 years, so I'm not a good judge to remember when I reached the...
  2. crutschow

    Timer circuit

    No, that's the opposite of my interpretation, if you carefully read my previous posts. You put more energy in the water by keeping the water moving at maximum speed. Slowing it down or stopping reduces the transfer. I need no help, and it's condescending to state that I do. Since you and...
  3. crutschow

    Timer circuit

    What makes you think I'm confused? It's you that seems to be confused. Nonlinearity has nothing to do with it. How can slowing or stopping the flow put more energy into the water, then leaving it flow at full speed, which it where it will absorb the maximum energy from the sun?
  4. crutschow

    Need a little help understanding the way my class AB power amplifier works.

    Okay. Tp1 and Tp2 form a differential input stage to allow AC and DC negative feedback to stabilize the output. Tn1 and Tn2 are a current mirror load to provide a high-impedance load for that stage to give a high differential voltage gain. Tn3 provides a DC drop (similar to that often done by...
  5. crutschow

    Timer circuit

    True, but sorry, you are wrong about this helping heat the pool. What you are wanting to do is adding unnecessary complexity and will actually reduce the amount of heat to the pool. It's simple physics. The amount of energy the panels absorb is determined solely by the sun and is maximum when...
  6. crutschow

    Need a little help understanding the way my class AB power amplifier works.

    It's difficult to discuss the circuit without transistor part designations (Q1, Q2, etc.). Could you add those to the schematic and repost it?
  7. crutschow

    I have question marks about my power supply circuit anyone can help?

    What signal/noise are you trying to filter? Can't know if the filter works without that info. Typically for AC analysis you use an AC voltage of 1V not 220V. That way the output is given in dB relative to 1V. Where is there 50 ohms?
  8. crutschow

    Design a short circuit protection for +15/-15 and +10/-10 DC power rails

    What value of current-limit do you want? A two-transistor limiter (example below) connected at the output of the bridge rectifier filter capacitors would work for that. Note that M1 would need to be on a heat-sink for other than momentary shorts.
  9. crutschow

    Low frequency adjustable but stable oscillator

    You are thinking about induction motors. Synchronous motors stay exactly in sync as long as they are operating properly.
  10. crutschow

    Low frequency adjustable but stable oscillator

    But here the motor is running fast, not slow.
  11. crutschow

    Low frequency adjustable but stable oscillator

    I'm also puzzled as to how that synchronous motor is not running at synchronous speed. Sounds like your 50Hz mains is not generating 50Hz but more like 55Hz.
  12. crutschow

    PWM with 50% duty cycle

    I meant to add, if the inverter has that output waveform duty-cycle then, for a given output RMS voltage, it tends to work properly both with resistive type loads, and with electronic loads that rectify the peak voltage to generate DC power.
  13. crutschow

    Very high current power supply

    Can you us AC instead of DC to test the fuses? If so, you could use a VARIAC to vary the voltage to a 115V transformer. The transformer could be a modified microwave or standard power toroidal transformer with just a few secondary turns to give a high current, low voltage output. You would...
  14. crutschow

    PWM with 50% duty cycle

    It reduces the RMS voltage which, of course, would reduce the power to a fixed load. If you reduce the duty-cycle to 25% (each half cycle on for 50% of the time), then the RMS output voltage will equal that of a sinewave with the same peak voltage.
  15. crutschow

    Very high current power supply

    Over what current and voltage range? You do realize that 300A at 12V is 3600 watts, which has to be dissipated somewhere. That's probably what zapped the MOSFETs. Using a 6V battery would cut the power in half.
  16. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    Then you need to determine exactly what the MC145028P decoder outputs for those three different signals, so you know what the Pi needs to generate. All you have at this point, is speculation.
  17. crutschow

    Using AC/AC wall adapter and converting to DC

    Can you measure the plus and minus currents from the supply?
  18. crutschow

    Op-Amp voltage follower output different from input

    What is the output with 0V in?
  19. crutschow

    Boost converter

    Then it sounds like normal initial inrush current at the converters startup.
  20. crutschow

    Boost converter

    What is the load? Does it settle to the proper voltage and lower input current?
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