Of course I meant that the DC rail fuses possibly cause damage as only one of them blows. The opposite of protecting anything. Witnessed this with amplifiers with DC fuses but no loudspeaker protection. This does likely not happen when having them at the AC primary side. Then both rails power off the more friendly way which saves at least 1 woofer. Worst case at some time one of the rails discharging in the woofer but at least it survives that contrary to one rail full voltage because a DC fuse blew.
Very aware of the necessity of fuses for a certain reason but used to slightly higher values 😉 Just not too many in my amplifiers and also no active current limiting. See post #117.
Very aware of the necessity of fuses for a certain reason but used to slightly higher values 😉 Just not too many in my amplifiers and also no active current limiting. See post #117.
Last edited:
I would say you have to combine fuse with some kind of DC offset protection to minimize the collateral damage. I have seen some non-working amps only because of blown fuse. That might be caused by short at output by accident. There is still value to add the fuses on the rails.
Agreed. There is no excuse not to have DC offset sensing and protection - ever. There must be a way to disconnect the load in a fault condition.
Repaired UK cottage industry and audiophile stuff in the nineties. These had DC fuses but no loudspeaker protection circuits. Also in audiophile circles loudspeaker protection was not in fashion. Burned woofers then were common after amplifier failure.
Last edited: