Sadly, not as many exposed components as I had hoped. I put a pot on the resistor that controls speed. I think that is a capacitor on the left next to the diode but the only thing it does is make a lovely burning smell.
The resistor near the pot seems to control volume.
Yard sale 20âŹ, one oscillator fixed, one key is missing a register voice, bass pedal is a little dodgy, spring reverb not working yet, all the rest is fine.
It has a selector for the turntable pickup (magnetic vs diamond) If the manufacturer was targeting people who spend money for a moving coil it canât be too bad i think.
At least, with 65Amps (minimum) per rail, you are sure you canât overload themâŠ
But you should check with a scope the âqualityâ (ripple) of the current they provide, they usually arenât great at that, and they donât really need because that 12V will be âdownsteppedâ and regulated on the motherboard.
Connect GND and output to your scope.
Most computer PSUâs will need some load to work correctly.
You have a modern digital scope ?
Just hit the âautoâ button and look at the result on screen.
Look at the display to see how much one division (one square of the grid) is, usually displayed as XXX V/Div or XXX mV/Div. It should also display either min/max voltage, or average and PP voltages.
This will give you an idea of how well it is regulated.
With an analog scope, youâll have to adjust manually the âtimebaseâ, âcenter Vâ and âV/Divâ controls to âzoom inâ on the curve.