This circuit triggers an LED when the input signal exceeds the peak, or the value set in RV1. The transistors can be the modern equivalents BC549.
We found this circuit in a 1964 publication. The circuit is both an amplifier and an oscillator for the...
This circuit was obtained from the 2005 manual of Linear Technology LT1306. The formulas for...
This is a traditional complementary configuration that provides good audio power with excellent...