Capacitor Polarity Question

[bostonman]

I have a silly question about C90 in the attached (circled in red).

This is the power supply section from a C64, and I want to confirm why the positive side is on the left. Usually if I see a capacitor in series, it's non-polarized, and, a polarized capacitor always connects to the positive; unless it's a negative voltage then the positive is to ground.

This could be an incorrect statement, but this may be a first time I've seen a polarized capacitor in 'series'.

I forgot the name of that circuit, however, I'm assuming the positive is on the left because it's the higher voltage, correct?

[Benta]

The positive is on the left, because there's a"+" symbol there.
Nothing wrong with the schematic, it's a charge pump voltage inverter circuit.

[bostonman]

I meant electrically why is it on the left?

What is the reason it's not connected to the right side instead?

[ledtester]

It's essentially because the left side of the cap is connected to the "+" terminal of the bridge CR4 (through a diode). That means it will always be greater than either of the AC inputs (pins 2 and 4). Since the right side of the cap is connected to pin 4 it makes sense to have the left side of the cap to be +.

[Damianos]

Have a look here Voltage doubler especially the two first circuits. Study them a little and then add the rest of the circuit (its easier to do that step by step).