This Hi-Fi amplifier circuit is suitable for a lot applications like general purpose amplifier, guitar amplifier, keyboard amplifier. The amplifier can be also used as a sub woofer amplifier but a subwoofer filter stage has to be added before the input stage. The amplifier has a low distortion of 0. Circuit diagram. Capacitor C8 is the input DC decoupling capacitor which blocks DC voltage if any from the input source. IF unblocked, this DC voltage will alter the bias setting s of the succeeding stages.

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Probe 2 — Purple — Attached to shunt resistor input pin. The current setting of the circuit was determined with a separate DMM. Ambient Noise This picture was taken after the end of the first test level.

The test system was left fully in place and the only change made was that the PSU supply was switched to standby. The addition of 0. Circuit set to 1. Circuit set to 2. Observations Both positive and negative amplitude variations were observed at both test levels.

They manifested as signal jumps, being whole lines, or slopes. It is important to note that these events were not spikes. The current sunk remainded steady and had only minor float. This same mV reading was observed with the supply set to standby, but it occurred as spikes. I am not saying that the maximum reading was mV, only that it occurred enough for me to see it among the flashes. Conclusion The jumps in amplitude will be investigated. I think my new scope can record a session.

If so, I will repeat the test and make a movie. My guess is that the jumps in amplitude may be a build up and collapse of the inductance? This is beyond my present knowledge, but I am sure Kleinstein can set us straight. I would think that the majority of the noise observed is from ambient sources. The results are encouraging.


100W MOSFET power amplifier

Indeed, one can attempt to switch-ify the circuit, but it quickly becomes a cluster, until you give up and embrace the full digital equivalent, a resonance-tracking PLL. At that point, you might as well drop the push-pull configuration as well, and use a more traditional bridge circuit. If you have a MHz scope, you might miss such behavior! Note also that the circuit requires shorting-mode commutation.




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