diggy fresh

Re: Roger Mayer RM57 build?
« Reply #340 on: June 26, 2019, 12:12:52 PM »
Thanks Spencer, that helps, way clearer now!
English is my second language, apologies

Autodidact audio geek, constantly learning.

Very interested in old technology, i mostly learn from the info you guys share on here, so thanks!


Spencerleehorton

Re: Roger Mayer RM57 build?
« Reply #341 on: June 26, 2019, 02:03:26 PM »
i think i made a mistake with putting 24v rather than 18v sorry!!

also X and S1 is the 18v rails
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

RuudNL

Re: Roger Mayer RM57 build?
« Reply #342 on: September 04, 2020, 05:08:04 AM »
Some time ago, I published my version of the 'modernized' Roger Mayer limiter:
https://groupdiy.com/index.php?topic=13287.msg907132#msg907132

I designed the PCB very quick, and didn't bother to place the component values on the layout.
Well, here they are!  (Some forum members asked for it.)
Take care of the orientation of the electrolytic capacitors! It might be that they are shown reversed on the PCB layout, because I didn't pay much attention to this when I designed the PCB. (After all: a capacitor is a capacitor...  :D )
Components are seen from the copper side of the PCB!!!
There is a solution for every problem!

http://www.vansteenisaudio.nl

Re: Roger Mayer RM57 build?
« Reply #343 on: September 04, 2020, 05:38:30 AM »
That's really cool ! thanks a lot. Do you happen to have gerbers as well ?

Cheers

RuudNL

Re: Roger Mayer RM57 build?
« Reply #344 on: September 04, 2020, 06:06:29 AM »
I don't have the Gerber files, but you can export them from the Sprint software.
There is a solution for every problem!

http://www.vansteenisaudio.nl

craig

Re: Roger Mayer RM57 build?
« Reply #345 on: September 11, 2020, 11:07:08 PM »
Hi Ruud
Could you please also give some values you used for your meter circuit
Thanks

Re: Roger Mayer RM57 build?
« Reply #346 on: September 13, 2020, 03:26:14 AM »
he already did a few posts above :

The VU meter I used is a pretty standard one (I think it was a Monacor), for the measurement of the output level it is simply connected through a 3.6K resistor to the output. (Driving impedance is low here, so no extra distortion from the rectifier in the VU meter.)
For the gain reduction measurement I am using an experimental circuit.
Without signal, the VU meter indicates 0 VU and moves back when gain reduction occurs.
At the moment I am still optimizing this circuit, because there are a few (small) problems:
- The '0 VU' drifts a little with temperature (You can see the small holes between the meters for '0 VU' calibration.)
- Indication isn't really exact. (At 5 dB a bit too much, at 10 dB a bitt too little.) Not a real problem, error is in the 1 dB range, but I would like to see the exact amount of gain reduction.


 

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