Wiparat Circuit Electronics

This first circuit is a very simple one transistor voltage follower. Consist of two biasing resistors, and one other resistor at the emitter to acquire the output voltage from.
The first to resistors connected to the transistor’s base are forming a voltage divider, in order to set a biasing point for the transistor to work in [...]

Here is a simple audio amplifier circuit that is easy to build and has few components. This circuit is built around the LM386 (click for datasheet) audio amplifier integrated circuit, useful when you need to power medium sized speakers from a music player that can only drive earphones.
From left to right, the first part is [...]

This is a pretty conventional design, using bipolar transistors in a tuned class C circuit. Thanks to the use of two stages, the amplifier can be driven to full power with less than 1 watt driving power, so that a large gain margin results in this transmitter.
Bipolar VHF power transistors have a severe affinity for [...]