The integrated circuit and configuration are uncommon. However, the sound quality is good. The circuit is from the 1983 Intersil Databook. The output transistors must be provided with heat sinks.
Based on an integrated circuit CA31062 which consists of a photosensor, this circuit was obtained from...
This 500 V line current monitor with the LTC6101 was obtained from Linear Technology's own 2005...
This is one of many timer settings with the 555 found on this site. This is the traditional...