Stk411-210e Circuit Diagram ^new^ Today

Below is the for one channel (Right). Left channel is identical.

: Ensure the heatsink surfaces are clear of dust and verify that the physical connection between the IC plate and the aluminum block has not separated over time. stk411-210e circuit diagram

| Pin | Name | Description | |-----|----------|---------------------------------| | 1 | NF1 | Negative feedback input (Ch1) | | 2 | IN1 | Audio input (Ch1) | | 3 | GND | Signal ground | | 4 | GND | Power ground | | 5 | OUT1 | Speaker output (Ch1) | | 6 | Vcc+ | Positive supply (+21V to +25V) | | 7 | Vcc- | Negative supply (-21V to -25V) | | 8 | OUT2 | Speaker output (Ch2) | | 9 | GND | Power ground | | 10 | GND | Signal ground | | 11 | IN2 | Audio input (Ch2) | | 12 | NF2 | Negative feedback input (Ch2) | Below is the for one channel (Right)

). These capacitors block upstream DC voltages from reaching the input differential pairs inside the IC. Shunt resistors (around If DC is detected, or during the initial

An external UPC1237 or discrete transistor-based protection circuit monitors the output for DC voltage. If DC is detected, or during the initial power-on delay, it opens a mechanical relay to isolate the speakers. PCB Layout and Thermal Considerations