22 Likes

Re: Stripped down transformerless 1176 workalike project
« Reply #60 on: December 01, 2015, 10:07:56 PM »
Unfortunately I'm not as smart as you guys are with electronics but I' more than interested in this kind of build! I'd like 16 channels of simplified 1176 and this thread is a godsend!

I'll stay around to see how it turn out!


grrrunge

Re: Stripped down transformerless 1176 workalike project
« Reply #61 on: December 02, 2015, 05:47:12 AM »
I was thinking, if I use a compressor as an insert, in TRS on my console, it be unbalanced, so in this configuration it's useless to have a balanced input and a balanced output.
It would be another way to cut the cost ... but maybe you are not going to use them in a TRS insert.

Of course. The mixer in our studio has unbalanced insert points as well, but we're looking to upgrade it in near future, so I wanted to keep the balanced in/out just in case.
The balanced out is just two resistors and a cap. The balanced in is one half dual op-amp and a handful of components.  Moneywise there's no big savings to be made there ;)
- Running for your life is good workout!

Re: Stripped down transformerless 1176 workalike project
« Reply #62 on: December 07, 2015, 08:21:39 PM »
yes, you are right.
Another question, as I would be interested in comparing the transformerless version with transformer version, would it be easy to add input and/or output transformers on this board ?

(I would like to build, for example,  7 transformerless and 1 with transformer to be able to compare them)

grrrunge

Re: Stripped down transformerless 1176 workalike project
« Reply #63 on: December 08, 2015, 05:30:44 AM »
It would be easy enough. Just replace R62 with the transformer primary, and take your output from the transformer secondary.
The primary impedance should be pretty high though. Otherwise the op amp might have a hard time driving the transformer.
- Running for your life is good workout!

jordan s

Re: Stripped down transformerless 1176 workalike project
« Reply #64 on: August 26, 2016, 04:11:48 PM »
Any way to rekindle interest in this project?

pvision

Re: Stripped down transformerless 1176 workalike project
« Reply #65 on: August 26, 2016, 07:44:08 PM »
Any way to rekindle interest in this project?

grrrunge has put a lot of hard work into it. It would be a shame for it to go to waste

Of all the projects I'd like to tackle, an 1176 is #1. I know exactly how I'd want it to sound and what features I'd want

I'd build it perhaps even more stripped down. I don't care about LED meters - I'd rather have a VU like the original

The USP of the 1176 is the way it sounds but I suspect ergonomics & the extreme simplicity of the original design play a significant part in their continuing appeal

Nick Froome

grrrunge

Re: Stripped down transformerless 1176 workalike project
« Reply #66 on: August 28, 2016, 01:59:14 PM »
I'm still interested in this project as well. Real life just got in the way :P
- Running for your life is good workout!

pvision

Re: Stripped down transformerless 1176 workalike project
« Reply #67 on: August 28, 2016, 04:10:59 PM »
How can we help with the project ?

Nick Froome

grrrunge

Re: Stripped down transformerless 1176 workalike project
« Reply #68 on: August 28, 2016, 06:34:43 PM »
How can we help with the project ?

Nick Froome

I'll have to look at everything again, as it's been a solid while since i last worked on this. A thorough schematic lookover to spot any mistakes would be awesome.

If anyone has got info on obtaining 2:1 and 6:1 ratios, that would be awesome too.

I'm also thinking about replacing the FD333 diodes with BC546's configured as diodes to obtain low leakage diodes without having to source the FD333's. Any comments on this?
- Running for your life is good workout!

peterc

Re: Stripped down transformerless 1176 workalike project
« Reply #69 on: August 29, 2016, 02:00:11 AM »
Hi

I'm also interested and willing to help out.

Peter
If opportunity doesn't knock, build a door.