Hello everyone, I wish you a very happy 2024!
I pulled out of my breasts two HEED CANOPUS mono amplifiers, I found the perfect compounds. I can find the diagram and I want to understand the parameters for the potentiometers.
If someone can help me?
regards
Gil
I pulled out of my breasts two HEED CANOPUS mono amplifiers, I found the perfect compounds. I can find the diagram and I want to understand the parameters for the potentiometers.
If someone can help me?
regards
Gil
Those are normally called trimmers or trimpots.
I'm not sure I understand the question. You want to know the resistance value?
That must be on the schematic.
These look like 3/4inch type trimmers like https://www.mouser.be/datasheet/2/54/3296-776415.pdf
Jan
I'm not sure I understand the question. You want to know the resistance value?
That must be on the schematic.
These look like 3/4inch type trimmers like https://www.mouser.be/datasheet/2/54/3296-776415.pdf
Jan
That should be in the manual/schematic.
It will typically list where to put the multimeter probes and the value to adjust for.
You can post the schematic here so we can take a look.
Offset should be easy - connect the DC multimeter on mV setting to output and ground, with shorted input.
Then adjust for minimum DC.
Jan
It will typically list where to put the multimeter probes and the value to adjust for.
You can post the schematic here so we can take a look.
Offset should be easy - connect the DC multimeter on mV setting to output and ground, with shorted input.
Then adjust for minimum DC.
Jan
The grey one is for offset adjustment and the blue one is for bias setting, but you should get the manual/schematic, as Jan said.
If you do not have a diagram / service manual and do not have experience in repairing and adjusting amplifiers, do not touch these potentiometers
If you have a problem with your amplifier, it is better to take it to a competent service center
A wrongly set DC offset can damage the speakers, a wrongly chosen bias can burn the transistors (looking at the photos of the amplifier - there is quite a small heatsink there)
If you have a problem with your amplifier, it is better to take it to a competent service center
A wrongly set DC offset can damage the speakers, a wrongly chosen bias can burn the transistors (looking at the photos of the amplifier - there is quite a small heatsink there)
I managed to set 1mv to 0R33/2W with the 1k trimmer, but I don’t know where to take the measurement to measure 10mv for offset?
I told you earlier, post # 6.
Also, why set 1mV on the 0R33? That's not what was recommended.
Jan
Also, why set 1mV on the 0R33? That's not what was recommended.
Jan
You don't understand how to short the input?
Or you don't understand 'minimum DC' at the speaker terminals?
Jan
Or you don't understand 'minimum DC' at the speaker terminals?
Jan
Short-circuit the input, it is on the RCA + and the - connect together ok? And the measurement is done in mv on the output HP?
That's a bit high. Does it show a minimum, like when it goes to 160mV, and you continue on the trimmer, it rises again?
Jan
Jan