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General description: The TDA8946J is a dual-channel audio power amplifier with an output power of 2 × 15 W at an 8 Ω load and a 18 V supply. The circuit contains two Bridge Tied Load (BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8946J comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8946J is printed-circuit board (PCB) compatible with all other types in the TDA894x family. One PCB footprint accommodates both the mono and the stereo products. Features: Few external components Fixed gain Standby and mute mode No on/off switching plops Low standby current High supply voltage ripple rejection Outputs short-circuit protected to ground, supply and across the load Thermally protected Printed-circuit board compatible Circuit Diagram: Circuit Diagram for 2 x 15 W stereo Bridge Tied Load (BTL) audio amplifier PCB layout: PCB layout TDA8946 Datasheet for TDA8946J: Download
2 corrections I'd like to point out:
ReplyDelete1. The diode between the 150k and 15k resistors should be mirrored horizontally, because the bias circuit going to the output tube should receive NEGATIVE BIAS in order for it to properly work. With the current schematic, you're feeding a POSITIVE BIAS, which will make the tube pull too much current, redplate, and fail.
2. The capacitors on that bias circuit are labeled as being "100W", when they should be "100V". They should also be mirrored, vertically, as the output from the rectifier diode will be more negative than ground, therefore the positive lead of those capacitors should go to ground.
Other than those errors, it seems like a nice circuit.