Tasel

This inverter circuit is very useful for low load application such as emergency light, radio, or DVD player. With transistors as main active component, please take more attention when you assemble this 100 W inverter circuit. Power source of this circuit just 12V DC, but can produce about 100W at 220V AC with simple assembling [...]

This circuit can be applied on any source of audio signal like microphone, mp3 player, radio, etc. The aims is smoothing the voices with echo. Using four ICs as main active components, produce a repetitious sound.

Here is 6-transistor 140 Watt audio amplifier. Using 2N3569, 2N3055, 2N4355, and MPS6533 this circuit can be useful for your home audio. The amplifier work with 30 V as the input voltage and produced output will be received by 8 ohm impedance speaker.

Here is a simple dancing LED circuit. Which based on NE555 & CD4017. NE555 is wired as an astable multivibrator to trigged the clock pulses for the CD4017. Pin 14 of CD4017 work as the clock input receiver, the outputs Q0, Q1, to Q9 (check pin diagram of CD 4017) becomes high one by one [...]

A simple mini stereo amplifier, which based on 2 chips. As pre-amp, there the MC1458 dual op amp, and the LM378 work as dual 4-watt amplifier.

A simple step up DC to DC converter with a maximum draw of about 800mA. Applying a op-amp as a square wave oscillator to trig an inductor and another op-amp in a feedback loop, provides a 24V power source for many uses.

DVD Signals RF modulator circuit which also can be used as a RF modulator. The brightness can adjusted by trimming the P1, P2 control the contrast of video signal. The circuit output is RF modulated and can be receive in VHF band.

This is a small and simple audio amplifier with TDA7294. Using 2 TDA7294 for stereo (2×80 watt) mode and bridge mode (180 watt). The TDA7294 for use as class AB audio amplifier.