Search results

  1. crutschow

    Thermal Resistance "per Leg"?

    You need to calculate the power in each leg and then use that to determine the total rise in temperature due to each leg's thermal resistance. If each diode in the bridge carries identical currents, than you can just calculate the thermal temperature rise for one and multiply by 4.
  2. crutschow

    converting a high amperage battery to lower amps without reducing voltage on a DC motor.

    In most cases, a motor only takes the current it needs, regardless of how much current the power source can provide. It's like your appliances at home. You can plug a 100W mixer motor into a socket that's rated for 15A, but the mixer only will take only the amp or so current it needs.
  3. crutschow

    2 VCRs both eating tapes

    Many of those VCRs used small rubber belts to operate some of the mechanism and they can fail due to rubber deterioration from aging. You would need to open them up and look for any broken belts that need replacing. You might consider converting all the tapes to DVD with a DVD recorder.
  4. crutschow

    6.3vac heater windings

    You are welcome. Since this has descended into sarcasm, I'll have no further comments.
  5. crutschow

    Simple, or so I thought. Creating circuit to transform 24vac control to 12vdc.

    Can you give us information on exactly what converters you are using?
  6. crutschow

    6.3vac heater windings

    That is an opinion and has no basis in fact. The CD accurately reproduces the original analog signal more accurately than vinyl ever can. And all modern recordings start out being recorded digitally, so how can you then get extra more definition if you convert it back to analog to put on vinyl...
  7. crutschow

    Simple, or so I thought. Creating circuit to transform 24vac control to 12vdc.

    To understand what you are doing please post a complete circuit diagram of all you parts and connections. If you have 24Vac, what is the purpose of the 24Vac to 12Vdc converters (and why three)? Don't you have 12V available? You might consider a battery operated home thermostat. I used one to...
  8. crutschow

    Has a PCB Been Powered?

    Why do you think they want to determine if it has been powered up? Certainly it will have been powered up during manufacturing test.
  9. crutschow

    6.3vac heater windings

    By method of recording, I mean vinyl or CD, and that obviously doesn't affect the sound stage, which you stated in post #5. If you prefer the archaic tubes and vinyl for listening, that's fine, but I never want to again listen to the the distortion (especially the inner grooves) restricted...
  10. crutschow

    Voltage regulator issue?

    What type of voltage regulator?
  11. crutschow

    6.3vac heater windings

    Not to my ear. And I've listened to a lot of vinyl in my day. What has the sound stage have to do with the method of recording?
  12. crutschow

    6.3vac heater windings

    Probably the same reason they like the reduced frequency response (called "warmer sound") and inner groove distortion of the old vinyl records. Go figure.
  13. crutschow

    Voltage regulator issue?

    !2V will not maintain the charge on a lead-acid battery (who's nominal full-charge voltage is 12.6V). From Battery University: The recommended float voltage of most flooded lead acid batteries is 2.25V to 2.27V/cell. Large stationary batteries at 25°C (77°F) typically float at 2.25V/cell...
  14. crutschow

    555 output question

    I also can think of no useful purpose for R2-C2.
  15. crutschow

    MOSFET 12VDC Relay?

    So it's just a broad-stroke criticism. He wants to improve the efficiency, so I don't see his system as "perfectly good".
  16. crutschow

    Need a new multimeter - any thoughts

    One good thing is to have automatic power off so you don't inadvertently run down the battery. I'm not sure how many of the cheap meters have this feature, but my free little Harbor Freight one doesn't, so the battery goes if I forget to turn it off.
  17. crutschow

    MOSFET 12VDC Relay?

    What issues? What is a "cobbled together" circuit as compared to a regular built circuit?
  18. crutschow

    MOSFET 12VDC Relay?

    The TS wants to use his switches in there original configuration, where a plus voltage from the switch activates the relay, which is why I added the transistor to provide that polarity operation.
  19. crutschow

    Rectified 24VAC to DC value?

    Note that in a real rectifier circuit, you have to subtract the forward drop of the rectifier (one for half-wave and full-wave, two for a bridge) from the calculated AC peak.
  20. crutschow

    MOSFET 12VDC Relay?

    Yes. It's determined by the input current, not the voltage. So you select the input resistor to give the desired input current. The resistance would be the signal voltage minus the diode input voltage (typically about 1.3V) divided by the desired current. But you only need the input current...
Top