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05-02-2023, 10:21 PM
Hi all.
I've always put in a bleeder resistor across the main power filter cap but not knowing how hot it gets. In a jcm800 style build I had a 27k 5W resistor across the main cap. Then I tested it with a 110K 7W resistor. It gets really hot to the touch. Not glowing hot but hot enough you wouldn't want your finger on it too long. Any good way to discharge caps? It's for safety but I'm worried the resistor might overheat and cause more danger.
I got these new higher resistor values based on the formula to calculate the resistance value as a function of the time and voltage.
I've heard of an active bleeder circuit which shuts off through a relay when the amp is on but connects back when you turn the amp off. Basically senses the mains voltage when on and disconnects from the cap. But this seems like too much of a project with the limited space I have in this amp build.
Any ideas?
I've always put in a bleeder resistor across the main power filter cap but not knowing how hot it gets. In a jcm800 style build I had a 27k 5W resistor across the main cap. Then I tested it with a 110K 7W resistor. It gets really hot to the touch. Not glowing hot but hot enough you wouldn't want your finger on it too long. Any good way to discharge caps? It's for safety but I'm worried the resistor might overheat and cause more danger.
I got these new higher resistor values based on the formula to calculate the resistance value as a function of the time and voltage.
I've heard of an active bleeder circuit which shuts off through a relay when the amp is on but connects back when you turn the amp off. Basically senses the mains voltage when on and disconnects from the cap. But this seems like too much of a project with the limited space I have in this amp build.
Any ideas?
