This powerful transmitter for the 27 MHz band was found in a Japanese publication from 1961. The circuit is powered by battery and has the details of the coils given next to the diagram.
This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms...
This timer of 10, 25, 45 seconds and 5 minutes has its times selected by the keys. The circuit drives...
When the power is turned on, the output that goes to the high Iogic Ievel is not necessarily the...