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.
The presented circuit provides an output voltage proportional to the input current, according to...
The general-purpose thermostat shown in the figure uses a high-resistive thermistor as a sensor....
This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no...