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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by Tony Stewart

  1. Tony Stewart

    Current sources in parallel...

    Make your own new rules with these two voltage (-2 to +2V) controlled current sources. The reference current, voltage and load resistance. Which ones dominate the result in series? https://tinyurl.com/2xzccg5g
  2. Tony Stewart

    Negative average power. What does it mean?

    All dissipated power is +ve and generated power is -ve. Thus Net phasor sum of energy is zero over an integer number of cycles, as all power is accounted for including that stored in LC reactors as no energy is destroyed.
  3. Tony Stewart

    Why can't I breadboard this oscillator?

    Where did you come up with this design? What made you think you could pulse such a high reverse voltage in both Vbe's? ( generally rated for Vbe=-5V max) LTspice I believe does not simulate component failures from voltages or currents or power. Nor is it psychic to see your layout for stray...
  4. Tony Stewart

    20W Power Supply for Stereo Amplifier

    For a Darlington Class AB BJT Amp drop +/-2.5 V from supply of +/-24V results in 21.5V driving stereo 8||8 ohms needs 5 3/8 A pk so the 6A supply will run hot but cooler than the 4A SMPS yet able to drive 115W /2 . Automotive stereo amplifiers get 22W per channel using differential power amps...
  5. Tony Stewart

    Photo interrupter Connections

    Hey the light direction is backwards too but then it has only 3 wires and is shown with "positive logic", Light on = +V out. Green is ground Red is current limited say 10 mA e.g. +(5V-2)/300 ohms White is pulse out 3V optical open, 0 V blocked. ( with no pullup) If schematic and results are...
  6. Tony Stewart

    Multi sla agm charger

    Do not use an automotive battery charger for small SLA batteries, as they are designed for excess voltage. >=14.2 rather than 13.7V Leaving a battery discharged for a long time can lead to sulfation, which can damage the battery (like overnight every day). Use a low voltage cutoff circuit and...
  7. Tony Stewart

    FSK SER on the same symbols

    How much ISI & SNR do you have? send 011011011... or 6DB6DB6.... measure SERDES jitter.
  8. Tony Stewart

    Continuity on 1/8” male headphone plug

    https://tinyurl.com/24thlpql
  9. Tony Stewart

    20W Power Supply for Stereo Amplifier

    Too bad the transformer is not properly sized for 20W This would have been be a cheap dual dcdc supply solution...
  10. Tony Stewart

    20W Power Supply for Stereo Amplifier

    SMPS includes all switching converters that includes; A) acdc & dcdc , B) isolated & non-isolated, C) positive & negative side load regulators. You need one of each positive and negative dcdc ,
  11. Tony Stewart

    how do we find the period?

    For periodic signals, the period of 1 cycle , T is simply one complete cycle using any starting point. - such as noon Dec 1 to noon Dec 5 = 4 daily cycles. - or from rising edge to the next rising edge
  12. Tony Stewart

    How to balance Milwaukee M18 tool batteries

    Zeners must be able to shunt all the power pumped into each cell, so I suspect your Zener solution will burn up. Tell us the max power under CC at say 4V. I would use something more accurate like a TL431 and a power resistor on the PNP collector to dissipate the power outside and place on the...
  13. Tony Stewart

    how do we find the period?

    The plot scale is inconsistent in time (e.g. -7 to -5) but the numbers from each polar edge are equal. But if you had a repeating binary data pattern that was 1T,2T (for +,-) the cycle would be 3T = 1/f although the pulse is no longer square so there will be even harmonics included that are...
  14. Tony Stewart

    Leakage Current to Earth Through Mains-Powered Multimeter?

    Without specifics on DC & AC current levels to divert impulse from the HV boost converter using a common mode noise filter to earth and the capacitor leakage resistance and the meter's leakage resistance , how can you be certain your explanation was complete. Perhaps someone should moderate the...
  15. Tony Stewart

    Switching negative voltages with a transistor (revisited)

    Is your load inductive or just 10 Ohms?

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