Help need protection circuit for this amp

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#41
Model 2800 - Kilowatt Mosfet Audio Amplifier
Hello
greetings been trying to find a short circuit protection for my amps and low impedance detector cut off the omni protector cuts off speaker out if load is below 2 ohms and cuts off if speaker wires are shorted but once short is removed does not reset i think i will try it again can this schematic work on bipolar transistor amplifier output stage NX AUDIO AMPLIFIERS have good short circuit protection i have seen the demo guy shorting the speaker wires on loud volume and the protection kicks in just cant get the schematic to see how its done
warm regards
andrew lebon
 
#42
I think That circuit that I posted for protection I think I know now how to connect it , will connect it across rail resistor On that protection there is SC ,DC, Delay ,temp, and I can make CLIP,SIG,PRO indicator and fan controll separately
So I will have indicators for CLIP,SIG,PRO,POWER, SC,DC,DELAY,OVER TEMPERATURE 🙂
 
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#43
This is protection for short , DC , Power on delay
You can use this
 

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  • uPC1237_current_sense_circuit_overload_detection_protection.png
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    uPC1237_current_sense_circuit_protection.png
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  • uPC1237_current_sense_circuit_overload_detection_protection_pcb.png
    uPC1237_current_sense_circuit_overload_detection_protection_pcb.png
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#45
Due to some patent issues one can not find a recommended schematic to do the current limiting job in the uPC1237′s datasheet. There is no built-in circuit either. However all you need is to monitor the current flow trough one of the emitter resistors at the output of the power amplifier. According to the datasheet pin 1 must be driven above 0.67V. This is the threshold. Rising the voltage above 0.67V will trigger the relay opened. Using a current source will require the pin 1 driven with current above 110uA.
 
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