Re: [BUILD] fripholm's TG1 Zener Limiter boards - support thread
« Reply #400 on: June 12, 2019, 05:31:49 PM »
Quick question:

SC and Mode switches, MBB or BBM?

Thanks


fripholm

Re: [BUILD] fripholm's TG1 Zener Limiter boards - support thread
« Reply #401 on: June 13, 2019, 12:24:53 AM »
If you have access to MBB, use these but you shouldn't have a problem with BBM either. I only had the latter kind for my builds and there are no negative side effects.

Some have reported loud popping noises when BYPASS switching the compressor and my mono unit sometimes does that, too. So it might be a good idea to use make-before-break in this position. However, my stereo unit, which uses relays switched by those rectangular console style switches, does not pop.

Re: [BUILD] fripholm's TG1 Zener Limiter boards - support thread
« Reply #402 on: June 13, 2019, 05:52:52 AM »
Thanks!

zerodb

Re: [BUILD] fripholm's TG1 Zener Limiter boards - support thread
« Reply #403 on: July 08, 2019, 09:02:52 PM »
Stupid question time:

If I'm reading it right, then comparing the schematics for this with the old Fester schematics, D13 has been added.
Is there any rationale for this?
Also, R41 appears to have been changed to 62k from 27k, if I'm reading it right...? Is this change to compensate for adding D13?

I see a few other resistor and capacitor value changes, but nothing particularly significant.

Are there other changes to be aware of? Which is closer to the EMI/Chandler design?

Cheers!

fripholm

Re: [BUILD] fripholm's TG1 Zener Limiter boards - support thread
« Reply #404 on: July 09, 2019, 04:21:55 AM »
It's been a while but if I remember correctly, I was trying to lower the distortion and/or noise a bit by lowering the threshold so the compression kicks in a little earlier. This increased the gain in the sidechain and with it the compression ratio. In this design a higher ratio also comes with a much harder compression knee hence D13 was added and the following resistor had to be changed to compensate for the higher gain. Despite those changes, I wanted the comp/lim knee to be like the original.

In the end, the threshold is only slightly lower than the original but the overall character should be the same.  One could argue that it wasn't even worth it  ::)

For other changes see the build guide and this thread. It's all been discussed before. AFAIK Fester's version is true to the original EMI schematic - I don't know anything about Chandler's version...


 

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