This logic tip latches on pulses. The TTL circuit was suggested by Radio Electronics magazine in August 1977. The power supply must be 5 V.
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
Found in a 1974 Ferranti manual, this circuit uses diodes to limit the voltage on the transistors. The...
This circuit is from an English publication of 1991. With it you can use a common multimeter on...