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100W Power Amp
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is a 100W Transistor based Power Amp Circuit. It's an old circuit, but nice circuit amplifier. Uses transistors MJ15003 and MJ15004, power supply +38V,-38V 3A. Output power is 100W for 8 OHM Speaker.


OCL Power Amp
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is old circuit Power amp OCL, But easy circuit and very nice. To use for play music in your home. It low cost too. It use IC 741 or LF351(good) and Transistor x 4 (2N3055+MJ2955+BD139+BD140) and little component. Power supply volt +35V/-35V and 3A for Mono, 5A for Stereo.


Stereo Tone Control Circuit with Adjustable Bass-Treble
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


PCB Tone control adjustable bass-treble Stereo by IC LM348


Loudspeaker Protection with Soft Start
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier. If a DC voltage is presented in the exit of amplifier, RL1 it interrupts immediately the line of loudspeakers preventing thus to reach in he. Parallel it provides a delay time of 3 seconds from the moment where the power supply will be applied. This delay protects the loudspeakers from undesirable bangs that are observed when open the supply switch.


TDA2030 Amp OTL 15W
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


Circuit of TDA2030 amp OTL 15W


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