Monday, April 04, 2016
BD139 BD140 100W Bipolar Power Amplfier
This is a plain 100 watt power amplifier circuit designed to subsist (relatively) tranquil to build next to a reasonable fee. Basef on Transistor BD139 and BD140 Bipolar power amp, It has a better performance (read: musical quality) than the standard STK module amps with the intention of are used in the sphere of almost all throng advertise stereo receiver manufactured at the moment. at what time I originally built this contraption, it was since I considered necessary a 100 WPC amp and resolve not fancy slightly money. So I designed around parts I had in the supply.
The design is essentially a standard format, and I’m positively present are business entities with the purpose of are alike. To my knowlwdge, it is not an exact emulate of a commercial entity, nor am I aware of one patents on topology. on behalf of practiced builders: I am aware to many improvements and adjustments can come to pass made, but the theory was to keep it straightforward and have to achieve-able by anybody who is a circuit, and has not the patience to do a sloppy mission.
If alone crave Bipolar Transistor power amplifier circuit. , clothed in fashion HIFI OCL 100W RMS. I think this track ought to ensue an remarkable array, this circuit is the get through of the fundamental transistor BD317 and BD318 save transistor digit BD139, BD140, BC556 too comfortable in that case try to procure after the 35V power source with simply then build is not complex on behalf of other details in the same way as the answer of a only some appreciate Circuit. Input stage is a BC556 transistor, which largely of the sincere ring benefit, and on the placid DC voltage stabilizes. This feeds a level remove stage wherever the voltage swing to (-) track references. The Transconductance stage is a Darlington, recover frerqency high-level linearity. The BD317, 318 on a instead great radio dish-heart volume is dependent on voltage. The BD319 presents this low-z and has a C (ob) of merely a hardly any of PF, which is effectively swamped by the pole-splitting 220pF cap. The commotion is supplied by BC546 in force load (current), which is approximately 20 mA. The current, until the BC556 is inadequate to approximately 70 mA taking part in the most awful belongings.
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