Through the TTL output this circuit can be used as a shield. The sensor is a platinum probe, and the operational amplifier can be replaced by a modern equivalent, preferably of low voltage.
This simple circuit was found in the November 1992 issue of Radio Electronics magazine. It...
This circuit generates pulses to trigger power controls with SCRs and Triacs. We found it in a...
This circuit works with the previous two by demodulating the signals received modulated in FM. The...