4 and TDA1387 chip directly replace TDA1541 audio decoding board SAA7220PIC digital-to-analog converter
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$77.36
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$77.36
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4 and TDA1387 chip directly replace TDA1541 audio decoding board SAA7220PIC digital-to-analog converter
$77.36
Sale price
$77.36
Regular price
$0.00
Description
SPECIFICATIONS
Brand Name: NONE
Condition: New
High-concerned chemical: none
Origin: Mainland China
Type: Module
Why choose 4 parallel connection instead of 8 parallel connection?
Because the TDA1541 is "inhaling" about 2MA of current per channel, there is 0.002*R (IV resistor) V DC voltage at the output.
In accordance with the 1.8K resistor: 1.8K * 0.002 = 3.6V at the coupling capacitor side
The TDA1387 is "exhaled" 0.54MA of current per channel, 4 and is 2.16MA of current, the out side has -0.00216*R(I/V resistor) V DC voltage.
According to the calculation of 1.8K resistor: the coupling capacitor has -1.8K*0.00216=-3.888V
Note for substitution
Because the TDA1541 output is positive voltage, so the circuit on the positive side of the coupling capacitor connected to the 1541 pin.
The TDA1387 is a negative output, so after the replacement, the coupling capacitor on the board should be reversed, or use
Use a non-polarized capacitor.
Because the TDA1541 is "inhaling" about 2MA of current per channel, there is 0.002*R (IV resistor) V DC voltage at the output.
In accordance with the 1.8K resistor: 1.8K * 0.002 = 3.6V at the coupling capacitor side
The TDA1387 is "exhaled" 0.54MA of current per channel, 4 and is 2.16MA of current, the out side has -0.00216*R(I/V resistor) V DC voltage.
According to the calculation of 1.8K resistor: the coupling capacitor has -1.8K*0.00216=-3.888V
Note for substitution
Because the TDA1541 output is positive voltage, so the circuit on the positive side of the coupling capacitor connected to the 1541 pin.
The TDA1387 is a negative output, so after the replacement, the coupling capacitor on the board should be reversed, or use
Use a non-polarized capacitor.
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