Found in Philips documentation from 1968 this circuit operates at frequencies up to 10 MHz with 76 dB gain. The double transistor can be replaced by a matched pair.
Found in old American documentation, this circuit is current as it uses the 555 to modulate an...
This audio amplifier uses 3 transistor in a traditional configuration named complementary output....
The UM3562 integrated circuit is a dedicated circuit found in many toys because it generates three types...