Category:UPC1237

µPC1327 

Loudspeaker protection integrated circuit current Chinese production, probably fake  image  Standard application schematic  schematic
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Instance of	integrated circuit model
Subclass of	loudspeaker protection integrated circuit
Item operated	relay
Developer	NEC
Authority file  Q115666404 Reasonator Scholia Wikidocumentaries PetScan statistics WikiMap Locator tool KML file Search depicted

The uPC1237 integrated circuit, originally marketed by NEC and now a generic noname product, is a speaker protection IC for power amplifiers. It monitors four parameters: positive rail voltage (being the power source for the IC and the speaker relay coil), DC content at the speaker output, presence of AC voltage at the power transformer secondary, and overload condition (the latter being a simple current input, relying on external overload-sensing circuitry). The uPC1237 provides power-on muting via a RC timing network, and an option of automatic or manual reset.
A very similar but more expensive Toshiba TA7317 is functionally the same, except that the TA7317 has two independent DC sense inputs, and the uPC1237 has one (two stereo channels are summed on a common smoothing capacitor).