(2) above also wrote "the power amplification circuit output coupling capacitance, and the speaker is not grounded, the so-called load floating, it is not convenient for repair, and the speaker is easy to burn out, this is the same with the OCL circuit," floating ground is easy to burn, because there is no ground, maintenance of instrument probe or pens and exposed to the circuit is easy to cause accumulation of electrostatic cause over voltage or current burn the horn?
Understand mould electric Daniel to help give directions, thank you!
CodePudding user response:
According to the output of the single voltage power supply OTL VCC/2, is the most large amplitude BTL output VCC is the most large amplitude, power is divided by the square of the load voltage, output power four times,According to the positive and negative dual voltage output is the most large amplitude VCC power supply OTL, BTL output of the value is 2 * VCC, power is divided by the square of the load voltage, output power four times,
Ac signal amplitude is refers to the communication of the positive half cycle or negative half cycle of the peaks and troughs and zero level difference among them,
According to the single power supply voltage analysis, OTL output by capacitance coupling output, coupling the output wave for the VCC/2, after the trough for VCC/2, the output amplitude for the VCC/2
According to the single power supply voltage analysis, BTL directly output, output wave to VCC, trough for the VCC, output amplitude for the VCC
According to the dual voltage power supply analysis, OTL directly output, output wave to VCC, trough for the VCC, output amplitude for the VCC
According to the dual voltage power supply analysis, BTL directly output, output wave for (VCC - (VCC))=2 * VCC, trough was 2 * VCC, output amplitude VCC to 2 *
"The speaker is not grounded, the so-called load floating, it is not convenient for repair"
Can understand this sentence, the speaker difference output, under test, the output of the differential measurement will have trouble, both positive and negative phase power amplification synchronous measurement will be more trouble at the same time, is not convenient to maintenance,
"The speaker is easy to burn out
"When the damage of power amplifier circuit, especially easy to dc output, the dc output, it is easy to burn out the speaker (speaker is electromagnetic coil driver, electrostatic won't damage the speakers), such as positive and negative phase discrepancy arises between the two way magnification of the power amplifier can produce dc output,