The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We found this setting in the 1994 National Semiconductor Linear Applications Handbook.
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...