Hello all, I'm messing around with an Alembic filter made from another user here. Everytime I make my own charge pump, it creates a lot of noise. So I just buy a voltage converter off Amazon. The first one gave me +/- 15v which was fine but I wanted to lower the headroom. I just got another variable converter that I can bring down to +5 volts but instead of -5v it gives me -15v. It stays -15v no matter how I adjust it.
Would this have a negative impact or any?
Voltage converter I bought; there is a review that mentions the same issue I'm having. I'm just looking for something that can give me a clean +/- 5-9volts.
I can't seem to paste the amazon link, but this is what it's called:
Boost Buck Voltage Converter, DC-DC 5V-24V to +/-3V-30V Step UP Down Power Supply Module Adjustable 20W Positive Negative Dual Output Voltage Charging Converter for Amplifier
https://tinyurl.com/mr3aekef
Giving an op-amp +5v/-15V
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bmxguitarsbmx
- Cap Cooler
That converter is 20W. Probably a little overkill. I have used the XL6007 modules with pedals reliably, and they are not only smaller, but cheaper. What you want to do is get one that is maybe +/-12V, then use lm7909 and lm7809 get get a nice clean, low noise +/- 9V to run your circuit.
I don't even always do that. I always add a reservoir cap to the input and two on the output as well. Then, depending on the current draw of the circuit, just do a RC filter. Especially if it is op-amp based (op-amps usually have the ability to reject the power supply noise), this can be fine. Using regulators is the professional thing to do though.
I don't even always do that. I always add a reservoir cap to the input and two on the output as well. Then, depending on the current draw of the circuit, just do a RC filter. Especially if it is op-amp based (op-amps usually have the ability to reject the power supply noise), this can be fine. Using regulators is the professional thing to do though.
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Ferniff
- Breadboard Brother
Thank you.bmxguitarsbmx wrote: ↑28 Jun 2024, 20:22 That converter is 20W. Probably a little overkill. I have used the XL6007 modules with pedals reliably, and they are not only smaller, but cheaper. What you want to do is get one that is maybe +/-12V, then use lm7909 and lm7809 get get a nice clean, low noise +/- 9V to run your circuit.
I don't even always do that. I always add a reservoir cap to the input and two on the output as well. Then, depending on the current draw of the circuit, just do a RC filter. Especially if it is op-amp based (op-amps usually have the ability to reject the power supply noise), this can be fine. Using regulators is the professional thing to do though.
I've been using it for a while and haven't had any issues, so I guess +5/-15v is alright for a state variable filter. Every time I've tried to make my own charge pump, it just introduces a lot of noise.