This filter for frequencies from 300 Hz to 3.4 kHz was found in the February 1995 Radio Electronics magazine. Other operational amplifiers can be experimented, and the source must be dual.
This circuit makes use of an unusual component today, a LASCR. It is a light-activated SCR. The...
This small transistor amplifier was found in an ancient American documentation. Transistors can be replaced...
This circuit makes use of a Linear Technology LT6100 having been taken from the component...