This low frequency oscillator circuit was found in an Electronic Design from the 90s. The transistors are common types, and the frequency is given by the crystal.
We found this simple warning circuit for car blinkers (arrow) in a 1987 publication. The relay must...
Based on common operational amplifiers, this circuit was found in Texas Instruments documentation. The power...
This circuit, found in US documentation, can measure the power of transmitters up to 10 W, given...