The Commodore PSU uses a series pass voltage regulator, but the manufacturer encapsulated it in resin. Unfortunately when subjected to stress (thermal cycling) especially when the PSU has insufficient cooling, the series pass voltage regulator may fail short circuit input to output. The result is that about 7 to 9V appears on the +5V output.
The PSU in an A3010 is completely different, so it's less likely that it will fail with an overvoltage fault.
Switching RF/UHF signals or trying to mix a composite video signal with a RF/UHF signal is not recommended. These are ultra high frequency signals and because of this, there are a lot of complications. RF/UHF signals are a completely different beast to DC, low frequency AC or digital signals. they can jump across the air gap between switch or relay contacts for example. And the different impedance of components can cause distortion of the signal.
Either completely disconnect the modulator (input and output) and just provide a composite video signal. Or provide a composite video signal on a completely separate connector.
Mark
The PSU in an A3010 is completely different, so it's less likely that it will fail with an overvoltage fault.
Switching RF/UHF signals or trying to mix a composite video signal with a RF/UHF signal is not recommended. These are ultra high frequency signals and because of this, there are a lot of complications. RF/UHF signals are a completely different beast to DC, low frequency AC or digital signals. they can jump across the air gap between switch or relay contacts for example. And the different impedance of components can cause distortion of the signal.
Either completely disconnect the modulator (input and output) and just provide a composite video signal. Or provide a composite video signal on a completely separate connector.
Mark
Statistics: Posted by 1024MAK — Sat Feb 08, 2025 9:05 pm