This amplifier for playback of recordings was found in a 1947 manual. It uses a push-pull output with a tube power supply.
This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay...
This two-transistor circuit is from a Radio Electronics magazine from April 1965. The transistors are...
This circuit was found in a 90s Hands On Electronics. The semiconductor component is a Triac of...