This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This small 3 transistor transmitter was found in an English publication from 1963. The coils must...
We find this circuit in a 1977 technical documentation. The circuit generates signals in a wide...
Found in a 90s Radio Electronics, this circuit is intended to trigger a relay when the current in...