A small 325mW amplifier with a voltage gain of 200 that can be used as a bench amplifier, signal tracer or used to amplify the output from personal radios, etc. The circuit is based on the National Semiconductor LM386 amplifier. In the diagram above,...
1W BTL Audio Amplifier
The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown...
Simple Servo Driver
When it comes to driving a servo you typically have to send a PWM signal
to the servo input. The frequency of this signal is about 50 Hz and the
duty cycle is variable. The duty cycle is usually between about 5 and
10%, corresponding with a pulse...
Automatic Battery Charger
Normally, chargers available in the market do not
have any sort of control except for a ro-tary switch that can select
different tap-pings on a rheostat, to vary the charging current. This
type of control is not adequate because of the irregular...
MP3 FM Transmitter Circuit Diagram
Here's a simple VHF FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio. The circuit use no coils that have to be wound. This FM transmitter can be used to listen to your own music throughout...