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80 watt impedance matching volume control

Stero keeps switching off, must have a circuit breaker. How do you test if the volume controls or the speakers might be shorting the stero out? The stero was working fine for 6 months now it shorts out after 2 minutes.

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Check your spekaer cabling first for any loose connection. if everything as usual then something is wrong with either your speaker system or the power output stage of your amp. you may call it a "circuit breaker" but it actually overload protection of the power amp so as not to damage speakers or amplifiers. have your speakers checked for burn coils. you can also try to remove or turn off speaker switch, turn on the power, level up the volume and see it the system still stays on and does not trip (as you called circuit breaker) if the unit remains on, then it must be your speakers. though it could also be a leakage in the power transistors of your output stage, it something a technical person have to do to check anyway.


Posted on Mar 26, 2008

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How can I connect a Realstic STA-960 reciever to my Fisher CA-276 amplifier

You can link them using Tape Rec Out on one amp and connecting it to one of the Line Inputs on the other. This will allow the same signal to be played out from both amps. Each amp will power its own speakers. The volume controls will need to be operated on each amp, IOW, they aren't linked.

If your idea was to link the amps to somehow boost the power then you're out of luck. You can't multiply power up in that way. Connecting the speaker outputs of one amp to the line inputs of another will just blow the input circuits.

Speaker output is anything up to 30 Volts and could be anything up to 8 amps when the speaker impedance curve dips to its lower ranges. Fortunately the input impedance of a Line In is generally very high; 10,000+ Ohm. So the input circuit won't draw that much current. The problem is voltage.

Line inputs will accept something in the region of 1~2 Volts from a source signal. That's equivalent to roughly 1/3rd of a Watt @ 1V. The volume control wouldn't be much higher than its lowest setting. As soon as you crank up the volume even a little higher, you'd overdrive the Line Input stage on the receiving amp. That would result in.... first.... massive distortion which would cause the speaker voice coils to overheat and short (High distortion = Dead speakers = Not good). Then the input circuits would fry and kill the receiving amp.

So, all in all, a very bad idea.

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CS Series amplifiers feature innovative circuitry for safe operation into any load. When an amplifier senses a load that

overstresses the output stage, the Load Fault Correction circuit adjusts the channel gain to a safe level. Extreme load

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For the Tascam DP-01 Digital 8-Track Portastudio, here are some of the specs:
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