Since alot of people are building these bad boys I thought I would see what configurations are out there and what people thought of the results.
I'm running the LM3875 with a single Avel Lindberg 330va w/ 25+25 on the secondarys and dual bridges. I'm using 8800uf for the power supply. Chip schematic is below.
I am definitely not done tinkering. I plan on going to dual 18v transformers, using smaller caps in the supply, and maybe getting rid of the cap at the input.
I'm running the LM3875 with a single Avel Lindberg 330va w/ 25+25 on the secondarys and dual bridges. I'm using 8800uf for the power supply. Chip schematic is below.
I am definitely not done tinkering. I plan on going to dual 18v transformers, using smaller caps in the supply, and maybe getting rid of the cap at the input.
An externally hosted image should be here but it was not working when we last tested it.
You can remove 6k8 resistor and connect + input to ground directly (I noticed improvement), you don't really need 22k resistor to ground on the input. Also, if your source is OK with DC coupling cap is not required (I don't use it). So your GC practically comes down to two resistors and PS. I like to use 1000u for filter caps. First, it is very pure and simple path for the currents (the leads are 1/2" and connected directly to chip pins) and I didn't noticed much difference when connected additional 1000cap in parallel, and I noticed degradation in sound when connecting 10,000 caps. Use MUR or MSR860 On Semi diodes as they influence sonics and if using sparate PS, experiment with a cable, as this inluences the sound as well.
So in general folks seem to feel that the zoebel on the output is superfluous as well?
Can someone explain how both the inputs can be connected correctly to ground (ie without either the 6.8k or 22k in cct) without having the inverting and non inverting inputs of the chip effectively connected tohgether? I don't understand.
Looks to me like they'd be linked at the ground point in which case the amp would get equal and opposite inputs and hence produce nada???
Pls slap me if I've missed something obvious from "Gainclones for Dummies"
Drew
Can someone explain how both the inputs can be connected correctly to ground (ie without either the 6.8k or 22k in cct) without having the inverting and non inverting inputs of the chip effectively connected tohgether? I don't understand.
Looks to me like they'd be linked at the ground point in which case the amp would get equal and opposite inputs and hence produce nada???
Pls slap me if I've missed something obvious from "Gainclones for Dummies"
Drew
Currently I'm using Sonic Frontiers TransDac (combined with a good transport, it sounds pretty good) with my Gainclone. The pots I'm using have 31 dents (Noble). On some recordings I found myself setting them 2 positions away from max. vol and on some other at half volume. It all depends on a way CD was recorded.
Peter
Peter
Peter,
I removed the cap yesterday, checked the offset and was no more than 20mv. I was using a cheapo RS cap and it sounds better without it. Here's all I have left.
I can't wait to compare my current setup to the one I'm building.
I removed the cap yesterday, checked the offset and was no more than 20mv. I was using a cheapo RS cap and it sounds better without it. Here's all I have left.
An externally hosted image should be here but it was not working when we last tested it.
I can't wait to compare my current setup to the one I'm building.
An externally hosted image should be here but it was not working when we last tested it.
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