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 step of high gain and high voltage supply with direct coupling is from a documentation from...
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
The integrated circuit used in this 1986 project is uncommon today, but the idea of the output...