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.
This conventional power supply uses integrated regulators for 1 A. Several regulators are used. The...
This amplifier was found in Burr-Brown documentation from the 90's. The gain can be programmed by resistor...
This circuit was found in the March 1999 issue of Electronics Now magazine. The meter is analog and...