Tasel

Based on three characteristics: good quality sound, easy to make, and not expensive circuit, this TOSHIBA DX is worth to try. Just need 36VDC voltage input as a fuel, the circuit can produce 100W output on 40 Ohm speaker or 50W on 80 Ohm, using a pair of TOSHIBA A1943 – C5200 per channel.

With 4 pairs of 2SC5200 and 2SA1943, this circuit can produce about 500W. Voltage input as the fuel is +/- 65V. And for best result, you must use heatsink and fan. This circuit also feature circuit protection using fuse.

Based on super hetero dyning principle. The circuit using 2 RF oscillators. The frequencies of all oscillators are at 5.5 MHz. The first RF oscillator consist of transistor T1 (BF 494) and a 5.5MHz ceramic filter. The 2nd oscillator is a Colpitt’s oscillator accomplished with the help of T3 (BF494) and inductor L1 shunted by [...]

This circuit ease you to control any appliance with infra red remote. Can be used for electrical devices like lamp, fan, etc. With power supply from itself, the circuit make the application compact and easy to control. The circuit looks for any modulated IR source and uses it to control a TRIAC, which then switches [...]

With 4 pairs of 2SC5200 and 2SA1943, this circuit can produce about 500W. Voltage input as the fuel is +/- 65V. And for best result, you must use heatsink and fan. This circuit also feature circuit protection using fuse.

This circuit possible to deliver about 200W power output produce by Phillips Semiconductor. Using 2 PHP1BN11QT, input voltage between 30 and 45 VoltsDC for this circuit, trigger the 4Ω impedance load speaker in to a powerful audio output. Other features of this circuit are THD+N (total harmonic distortion-plus-noise) PL = 10 W frequency range from [...]

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 the VU meter with 12 LEDs circuit. This is an easy visual indicator of the audio level signals. Can be applied to various input levels, adjusted by trimmer TR1 (state) – TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods) and provide in the main circuit indication, consisting of the diodes [...]

Basic operation of this circuit is similar DC to DC converter. With input from 18VAC at 800mA then converted to DC by B1 bridge rectifier. R11 work as adjuster, a twin of IRF510 as final amplifier, and a CT transformer is the last converter to provide the high voltage output.