This excellent tube preamplifier was found in Radio Electronics magazine from July 1958. The power supply was not included. The circuit has several inputs.
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...