This Japanese commercial radio with 5 transistors is from the 60s and is powered by 6 V. It is a conventional superheterodyne configuration with good performance.
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...