General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
This circuit can use any comparator or even an operational amplifier. We can use the LM339 and the...
This is a Wah-Wah circuit for guitar sound effects. The circuit is placed between the pick-up...
This circuit was obtained in an English publication of the 80's, finding applications in...