This circuit was found in a Modern Transistor Workbook from 1965. The circuit sends signals from a small record player to a medium-wave radio placed nearby.
This circuit was found in a 90’s 303 Circuits. The components are from the period and the heating...
This circuit is from a 1978 publication, being connected to the contact breaker of cars that still...
This circuit was found in Linear Circuits Applications of Texas Instruments, originally using the...