We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The transistor must be a high voltage type and the LM3900 power supply must be symmetrical.
Taking advantage of the same basic configuration of the super-regenerative detector of the...
This circuit trips a relay when it stops receiving a signal. The transistor is germanium. We found...
This circuit with the HA2400 was found in the March 1980 Radio Electronics magazine. The circuit has...