This circuit was found in a 1967 US publication. In it we have the implementation of a ring counter using only relays. Relay free contacts can trigger indicator lamps or LEDs.
Found in a 90's EDN, this circuit changes the phase of a signal from 50 to 60 Hz in 120 degrees. The...
The LM320 is a negative voltage regulator up to 15 V with maximum current of 1 A. In this circuit we...
This circuit was found in a 1967 Philips documentation. The circuit fires when light stops hitting the...