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Chip Amps Amplifiers based on integrated circuits

LM1875 Amp layout
LM1875 Amp layout
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Old 2nd June 2019, 03:31 AM   #11
Dunk02 is offline Dunk02  Australia
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Eliminating the preamp circuit created a bit more space and I have rearranged it.
Do people still use thermistors on the mains power input?
Should I mount the amplifier boards on aluminium angle or just bolt them straight to the chassis?
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Old 2nd June 2019, 03:53 AM   #12
ubergeeknz is offline ubergeeknz  New Zealand
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Can the protection board go vertical? If so I would move it's transformer into it's place as it's a but close to your amp board
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Old 2nd June 2019, 04:03 AM   #13
Dunk02 is offline Dunk02  Australia
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Thanks for the suggestion. Picture attached.

Not really sure how to mount the small transformer : maybe glue it upside down or put it on a pcb and mount is properly?

Anything to consider when running wires to the front on-off switch?
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Old 2nd June 2019, 04:11 AM   #14
ubergeeknz is offline ubergeeknz  New Zealand
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You'll probably want it further from your inputs or you'll pick up the mains hum there. Perhaps turn the speaker protection other way so it can clear those big relays.

If it's just for you and you know not to throw it around, glue or strong double sided tape should be okay. Definitely heatshrink (double even) the connections so there's no mains voltage exposed. If you're a belt and suspenders type then you could make up a bracket or something and screw it down, or loop a cable tie around it. A PCB would be tidier of course.
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Old 2nd June 2019, 04:16 AM   #15
Dunk02 is offline Dunk02  Australia
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Like this?
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Old 2nd June 2019, 04:19 AM   #16
PKI is offline PKI  United States
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LM1875 Amp layout
why not moving the transformers and all PS stuff front and make a shaft extension for you alps and keep all signal Stuf close to the input output?
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Old 2nd June 2019, 04:32 AM   #17
Dunk02 is offline Dunk02  Australia
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Thought about that but it is tight and I would have to remove the binding posts on the power board and hard wire, I think. No room for shaft extension!

Keep the ideas coming! Want to get this a good as possible.
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Old 2nd June 2019, 04:53 AM   #18
ubergeeknz is offline ubergeeknz  New Zealand
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Do you think these small amps could share one heatsink? If you kept all the power supply components in one side (the bottom in these images) you could keep AC well away from the signal path. Just a thought. something like below

-----------------------------------------------
in. Amp. Amp vol

Spk. Prot. PS
Spk. PCB. PCB

Prot
Trans. Toroid. Sw
Mains
-----------------------------------------------
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Old 2nd June 2019, 04:56 AM   #19
ubergeeknz is offline ubergeeknz  New Zealand
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Better representation. Screenshot_20190602_165525.jpg
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Old 2nd June 2019, 05:03 AM   #20
Dunk02 is offline Dunk02  Australia
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I suspect you may be right, especially since the chassis is completely metal and screwed together tightly. Is this what you mean?
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Last edited by Dunk02; 2nd June 2019 at 05:06 AM.
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