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  1. Ylli

    Can you help me find the right Operational Amplifier for vintage sampler looking at the schematics

    Edd, I think this is an artifact of the external lighting. The left side of the display brightens up when he pans the camera to the left.
  2. Ylli

    Can you help me find the right Operational Amplifier for vintage sampler looking at the schematics

    The problem you describe is not likely a bad opamp. Might be a bad switch SW101, or other component. Ssyniu, I'll leave you in the very capable hands of Edd. I suspect he is going to use the good channel to signal trace the bad channel.
  3. Ylli

    Can you help me find the right Operational Amplifier for vintage sampler looking at the schematics

    Found the manual here: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjEm8Di1PTjAhWQB80KHURWBEkQFjAAegQIARAC&url=http%3A%2F%2Fwww.synfo.nl%2Fservicemanuals%2FAkai%2FMPC3000_SERVICE_MANUAL.pdf&usg=AOvVaw1ThbzuavzrLI12aA4j7v1g Actual schematic of this...
  4. Ylli

    Powering Electronic Match

    Might want to check with the model rocketry guys - there has been discussion on igniting boosters at altitude. It can be problematic. Hope management doesn't mind if I post a link to a different forum... https://www.rocketryforum.com/
  5. Ylli

    Powering Electronic Match

    You are on the right track putting those low current batteries in parallel to allow them to deliver a higher current. From how high are you launching? You are using Candy fuel? Under low atmospheric pressure, you really need to be sure the igniter is in good mechanical contact with the...
  6. Ylli

    Powering Electronic Match

    Why are you making this so complicated? An standard Estes igniter will fire just fine on a single good quality alkaline 9 volt battery. If you really are shooting for reliability, then you need to use a commercial e-match. re using multiple 9 volt batteries in series... Your load...
  7. Ylli

    Yamaha Aventage RX-A810 does not turn on

    That wording is confusing to me. Do you have that 5.5 volts from one coil terminal to the other coil terminal, or do you have that voltage from one coil terminal to ground? It sounds like you probably have 5.5 volts from one coil terminal to ground. So the "AC-DC Converter" is working. But...
  8. Ylli

    Yamaha Aventage RX-A810 does not turn on

    Use extreme care in this area as you are working with an un-isolated AC line. Can you measure the voltage RY371? Not to ground, but directly across the relay coil. Should be near 5 volts. With 5 volts across the relay coil,. it should pull in and energize the main transformer. Sounds like...
  9. Ylli

    10.7 MHz oscillator with transistor

    With a 3 volt supply, your biasing is going to be fairly critical. As shown, the 2n3904 is not biased on at all. Try reducing that 39K to a 10.1K.
  10. Ylli

    How would a twisted pair effect a signal

    Or perhaps the ECU simply needed to recreate the fuel map.
  11. Ylli

    How to: power this old ringer?

    60 - 90 VAC, 20 Hz in the US.
  12. Ylli

    Tapping 12V from 24V Battery Source

    Yes, some switching supplies require a load to operate. Some do not....
  13. Ylli

    Tapping 12V from 24V Battery Source

    Yes, the method you posted would work, but you would be using one battery more than the other. Depending on how much draw there is on the 12 volt tap, you may have to charge the batteries separately so that one doesn't get over/under charged. And you would probably want to rotate the batteries...
  14. Ylli

    Tapping 12V from 24V Battery Source

    Use a switching regulator to drop the 24 volts to 12 volts. That will keep the batteries balanced. Example...
  15. Ylli

    HP 1740A Gain vs Position Problem

    Same issue on both channels? I'd start by looking at the power supply. Make sure all the voltages are right and that they do not vary with vertical position adjustments.
  16. Ylli

    Beginner Amp Hour Question.

    Close, but since you are drawing more current than the 10 hr rate, the actual usable battery capacity will be a bit less. Probably 4.5 - 5 hours.
  17. Ylli

    plastics electronics crack

    The only chance you have to permanently fix these is to solvent weld the cracks. That would mean you would need to know what type of plastic it is. Then you would need to slightly expand the cracks so the solvent would flow into the crack, then find some way to clamp the crack back closed...
  18. Ylli

    plastics electronics crack

    These almost look more like scratches than cracks. How did these cracks occur? Did you try to install oversized screws? Otherwise, I have had RCA assemblies like these strip out, but never actually crack (they are used all over in audio equipment). If the holes are stripped out, using the...
  19. Ylli

    Denon DRA-545RD

    Glad it's working. You did all the hard work!
  20. Ylli

    Denon DRA-545RD

    If C645 was pulling that line down, you might also want to check D606 and the bridge of D504-7. And check the value of R503.
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