This circuit was found in a 90s Popular Electronics. The circuit uses components from that time, intended to receive signals in the range of 150 to 250 kHz.
This circuit was obtained from an 1974 Everyday Electronics magazine. The circuit is still current as...
Found in a 1970 EEE, this circuit can be applied to TTL ports. The supply is 5 V and the...
We found this circuit in the April 2013 issue of Electronics Now. Any JFET can be used. Note the...