Found in Ferranti's 1969 documentation, this circuit can be mounted with a modern equivalent transistor. The circuit has a 4 V immunity and can be used as a shield for sensors.
This circuit is from the Linear Applications Handbook from National Semiconductor, providing an...
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
This circuit distorts the voice of the speaker to the microphone thus making it difficult to...