Overload Speaker Protection Circuit Diagram input is taken from the terminal loudspeaker or
amplifier output jacks. If the right channel is large enough to charge
C1 to a potential which exceeds the breakdown voltage of the emitter of
Ql, a voltage pulse appears in R7. Similarly, if the left channel signal
is large enough to charge C2 to a voltage that is greater than the
breakdown voltage of the emitter of Q2 `, a pulse appears in R7. The
pulse triggers in R7 5CRI. A door sensitive SCR (LGT less than 15 RNA or
IGT is the gate-trigger current) that locks in a conducting state and
energizes Ryl. The action of the relay will interrupt the speaker
circuit. and silence follows you must alert on the problem.
Overload Speaker Protection Circuit Diagram
Reduce the volume on your amplifier, then press and release 51 to
reset the circuit and restore normal operation. The circuit can be set
to go off at any level of 15 watts RMS to 150. To calibrate .
deliberately over-power signal at the entrance of the right speaker
protection and adjust R3 until RY1 boosts. Do the same with the left
channel, this time adjusting R4. The circuit is now calibrated and ready
employment.
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