diy speaker protection circuit

Electronics Help Care May 20, 2025 Speaker

diy speaker protection circuit:

diy speaker protection circuit for the soundbox. Every amplifier needs this circuit. This diagram protects the speaker from unwanted voltage from the audio amplifier. Sometimes the amplifier burned, and the voltage came out directly from the speaker output. This board has a relay to protect. If this board gets DC voltage to the input, then it can’t switch on the relay.

This board runs with a 12 DC voltage. It’s a stereo diagram. It has 2 audio inputs and 2 outputs. But the speaker’s ground voltage must be connected to this circuit. The 12-volt ground and speaker output ground must be together. Otherwise, it can’t work properly. and must connect the sound to the SP input and take the sound from the SP Output to the speaker.

The circuit diagram

2sc5200 and 2sa1943 transistors details

This is the 2sc5200 and 2sa1943 transistors details. These are the best transistors for the audio amplifier circuit diagram. maximum amplifier circuit used this pair of transistors.

2sc5200 and 2sa1943 transistors details

This is the amplifier circuit board with speaker protection using transistors. here use 2sc5200 and 2sa1943. This is the transistor board only here needs an amplifier driver circuit board. It’s a mono amplifier circuit board. Here, use 6 transistors. 2sc5200 and 2sa1943. We can also use another transistor. PNP and NPN transistors. We can use 25-0-25 voltage to 70-0-70 voltage in this circuit.

Using ±35V supply → about 80W – 100W RMS (8Ω). Using ±45V supply → about 120W – 150W RMS (8Ω). Using ±50V supply → up to 150W – 180W RMS (8Ω).