This is small integrated amplifier at 20W using a TDA2004 or TDA2005 IC,use 12V supply for BCL car audio amps
This is many LED flasher circuit and with PCB layout using transistors astable multi vibrator as low frequency oscillator below more...
This is Simple automatic battery charger circuit, using the small SCR and relay is cheap and can use all battery size by input source.
This is First stereo tone control board for a electronic students, so small,easy to build all in one PCB ,cheap. use transistors, few parts so low noise
The peak hold vu meter circuit on 12 LEDs stereo system and use L1424 as main so easy to build with PCB layout to peak voltage detector
High performance LM3914/LM3915 VU meter circuit projects that widely popular can display with 20 LEDs on stereo or mono with 10 LEDs for all audio system.
The digital clock circuit board using LM8365,alarm and relay control, alert 2 times in 24 hour,backup battery power outage. Show dates, months or seconds