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  1. P

    Part Number of a Copley Control Board

    What is the product model number?
  2. P

    How to limit amplifier output power

    I used to use a self-resetting fuse.
  3. P

    Treadmill board controller issue Urgent!!

    https://www.lifespanfitness.com/fitness/resources/articles/what-does-your-treadmills-error-code-mean
  4. P

    Need help identifying a component from HP laptop mother board

    What is the HP model number?
  5. P

    Eico 324 inductors

    Yes if you knew the low and high value of the variable capacitor, you can determine the inductance. I have a chart that lists frequency and L and C impedances. A long time ago I saw a parallel tank circuit that used a 5-30pF variable but no value for the inductor. At 30pF it resonated at 70MHZ...
  6. P

    Power supplies not working on Sony ICF-SW7600G

    If resoldering doesn't work, spray the jack with contact cleaner or WD-40. The contacts may be dirty.
  7. P

    CostCo Christmas Tree Transformer Replacement

    Welcome. Why do you want another transformer if it's the plug that's broken?
  8. P

    LED Edison-style patio lights

    I'm not sure about that. I actually use dead strands as extension cords for the good ones.
  9. P

    Help identifying toaster controller/timer chip

    Sounds like it's time for a new one!
  10. P

    Help identifying toaster controller/timer chip

    Are you sure that chip is the problem? If so, perhaps you can use the PT8A chip and alter the pinout with wires to the circuit board.
  11. P

    Help identifying toaster controller/timer chip

    Welcome. It looks possible they replaced the chip with a microcontroller. The 8 pin PIC series that I use has pin 1 for B(+) and pin 8 for (-) ground.
  12. P

    SMT REPLACEMENT?

    My guess is a TO92 would work but... https://www.findchips.com/search/2SC3928A Here are some possible replacements: https://alltransistors.com/crsearch.php?mat=Si&struct=NPN&pc=0.2&ucb=50&uce=50&ueb=6&ic=0.2&tj=125&ft=200&cc=2.5&hfe=120&caps=SOT23
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    Schematic Needed for Ballantine Oscilloscope

    I saw your posts on another forum for this. I scoured the internet and found nothing. I believe you're going to have to do some basic troubleshooting on your own. What is wrong with it? From experience, I have found that before I do anything on older electronics, I clean all switches and...
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    Signal lenght detection

    I’m not at my workbench now so I can’t be too specific but it sounds like you need a simple R/C arrangement that will delay the transistor from turning on until the capacitor is charged. Try the output through a series resistor, an electrolytic to ground, then another series resistor to the base...
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    How do I test these transistors? (electronics noob here)

    Do they get hot before the protection circuit activates?
  16. P

    CD songs distorted badly first two or three songs.

    Service manual: https://elektrotanya.com/sony_cfd-758_sm.pdf/download.html#dl
  17. P

    CD songs distorted badly first two or three songs.

    Open the unit up, locate the laser lens and clean it with a cotton swab wetted with contact cleaner. You can use rubbing alcohol but if you do, wait a while before playing a CD as rubbing alcohol has water content.
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    DAB Radio power/speaker issue

    Welcome. It sounds like a headphone jack problem. Check for dirt or corrosion.
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    Sansui 7000 Receiver with weak FM

    If parts were still available, you could order an F-1323 front end module. And I'm sure it is a sardine can by the shielding in the schematic. You can check the IF for amplification but if it is OK then you have to open the module. I just found this...
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    Sansui 7000 Receiver with weak FM

    It can be anything but if you have limited knowledge, just replace the front end FET. That might solve the problem. Otherwise, you would need your signal generator and scope to test each stage for amplification from antenna down to the 10.7MHZ IF stages. Posting a schematic would be helpful...
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