This circuit was found in Radio Electronics from the 90s. The CMOS integrated circuit is a PLL not easy to obtain today. The output stage can be exchanged for another one with greater power.
This two-tone decoder has a bandwidth of 24%. The circuit is from a 1994 Electronics Now. The...
Bike speedometer (CB20497E) This circuit can be powered by a solar cell. The circuit is from a...
This is a typical common collector amplifier step configuration. The transistor can be used...