This transmitter for the 3.5 and 7 MHz ham radio was found in a 1950s Japan publication. No information was given on the coils and the power supply.
This circuit can be found in a 1970 Motorola documentation. The circuit can be implemented with general...
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...
This circuit of a 1991 PE Hobbyst Handbook allows the brightness of the incandescent lamp to be...