This fader or fader was found in a 90s Popular Electronics. The circuit uses transistors that are equivalent to BC548. Input and output cables must be shielded.
I got this4 circuit from Hands-On Electronics, 1988. The American magazine no longer exists, but...
The A3906 integrated circuit from Allegro Microsystems (www.allegromicro.com) consists of a PWM...
Found in National Semiconductor documentation from the 1990s, this circuit employs basic...