madbeanpedals::forum

Projects => General Questions => Topic started by: LaceSensor on July 26, 2025, 08:23:48 PM

Title: Mosfet Pair
Post by: LaceSensor on July 26, 2025, 08:23:48 PM
Hi

I am looking into envelope control of PT2399 or similar.
I have a snazzyfx wowflutter that does this quite well.

The circuit snippet here seems pretty wasteful of a DIP14 chip



Could you replace that with just a MOSFET pair like this?
Title: Re: Mosfet Pair
Post by: Aleph Null on July 26, 2025, 10:07:19 PM
If I'm reading this correctly, you've got a partial rectifier that's being used to send control voltage to a voltage controlled resistor. You could probably get away with replacing the whole IC with a high gain BJT. you might have to twerk some values to get it to work optimally.
Title: Re: Mosfet Pair
Post by: LaceSensor on July 28, 2025, 10:42:46 PM
Yeah but can I use the Mosfet pair :)
Title: Re: Mosfet Pair
Post by: Aleph Null on July 29, 2025, 02:32:56 AM
Probably?