Please give me advice,
I have two identical D-amps and I want to bridge them. I have an input converter (phase reverse). Each amplifier has its source approx. +/- 70V, but the voltage is not exactly the same. One has +-68V, the other +-72V. Can a bridge amplifier work like this or does it have to have one common source?
I have two identical D-amps and I want to bridge them. I have an input converter (phase reverse). Each amplifier has its source approx. +/- 70V, but the voltage is not exactly the same. One has +-68V, the other +-72V. Can a bridge amplifier work like this or does it have to have one common source?
Hi. Probably you mean two identical amplfiers of d-class , which are not-bridged ,but are powered by a little different voltages. Most of d class amplfiers are already bridged configuration, so check this at first, if none of speaker output wires are connected to ground , then already bridged . Do you mean +-70v (140v total) supply voltage, or 70v with negative conneced to ground?
Different supply voltage in bridge is not good i think, output will be limited by weaker amplifier, also have in mind , load for each amplifier is doubled , can amplfier and its power supply withstand this? Bridging is useful when amplifier designed for 4 ohms in example , but you have 8 or even 16 ohms load and power is very low without bridging .
Different supply voltage in bridge is not good i think, output will be limited by weaker amplifier, also have in mind , load for each amplifier is doubled , can amplfier and its power supply withstand this? Bridging is useful when amplifier designed for 4 ohms in example , but you have 8 or even 16 ohms load and power is very low without bridging .
Assumed two identical yet separated symmetrical power supplies with +/- 70Vdc outputs, with 2V deviation (< 3%) which is normal for power supplies.
But do check ximikas suggestion first ("Most of d class amplfiers are already bridged configuration..."), as this is crucial!
But do check ximikas suggestion first ("Most of d class amplfiers are already bridged configuration..."), as this is crucial!
With +-70V i mean 2 wires or 3 wires going from psu to amplifier itself . Old single supply amplfiers with output capacitor had power supply pins like "+" and "-" too ,but no mid point . One of pins , mostly negative , was also connected to GND ,and this changes "-" meaning , that there is no negative voltage present ,refered to gnd . TPA3116/3118 amplifiers are single supply as example ,but already bridged ,and their gnd can be understand as single supply minus terminal.
In other words ,single supply is 2 wires , dual supply is 3 wires and two voltages ,connected in series .
Bridging also can be determined if looking inside amplfier , if there's a single channel output ,but two bigger output inductors , then amplifier is bridged .For stereo bridged you would see 4 identical inductors near output devices .
In other words ,single supply is 2 wires , dual supply is 3 wires and two voltages ,connected in series .
Bridging also can be determined if looking inside amplfier , if there's a single channel output ,but two bigger output inductors , then amplifier is bridged .For stereo bridged you would see 4 identical inductors near output devices .