Found in 1969 Ferranti documentation, this small font is characterized by its low ripple. Transistors can be common for general use, due to the low operating current.
This circuit is from Radio Electronics. The magazine no more exists, but the circuit can be...
Found in a 1990s US publication, this alarm circuit detects when a light beam is interrupted. Optical...
This telephone circuit was found on a 90's EDN. It keeps a flashing LED to indicate that there was a...