This board is composed of 2 independent speaker protection boards, which is convenient for the use of power amplifiers with separate power supply for the left and right channels.
When the left and right channels are completely separated, two sets of AC power supply; one set of AC power supply can also be used
UPC1237H is the core protection circuit, with power-on delay, shutdown instantaneous interruption, and mid-point over-high protection
Adopt 16A high current OMRON high reliability relay
The board is small in size (109*61mm), which is convenient to install on the bottom or back of the power amplifier
Finished product 12v version: 2 sets of AC9-20v, using 7812, 12v relay
Finished product 24v version: 2 sets of AC20-25v, using 7824, 24v relays
When used in a two-channel integrated power amplifier, the AC power supply can be connected in parallel, and a group of power supplies can be used for power supply
When the protection board is used for OTL power amplifier (capacitor output, such as 1969, A21) protection, the board R1 uses 16-32 ohms/1w resistor
The finished board adopts American ALPHA solder, pure manual welding, reliable quality
Printed board size: 109*61mm, 2mm thicker printed board, 70um thicker copper foil, (usually 35um, thick copper is the last word)
The finished board adopts 6.35 plugs, matching plugs
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