Just some pics from my 1176 clone
- Thread starter FotisGR
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Jonathan Hayward
Well-known member
Aaah, Fotis, I was thinking about your amazing ground-planes this morning, I think the 1176 is the ideal candidate for them.
Absolutely gorgeous :thumb:
Absolutely gorgeous :thumb:
Thank you friends.
About double sided pcbs ( the upper side is the ground plane ) is standard technique for RF projects. Is oneway for remove ground loops, rf interferences, etc. Finished the 1176 it worked at once without any kind of hum or something like this. Also think that this unit is working on abroadcast radio station!! This means many KW of RF around, many equipments etc. Also building green mic pre with this technique, is quiet like DEATH!!!
see my green updated version:http://www.qsl.net/sv3eao/micpre.htm
About double sided pcbs ( the upper side is the ground plane ) is standard technique for RF projects. Is oneway for remove ground loops, rf interferences, etc. Finished the 1176 it worked at once without any kind of hum or something like this. Also think that this unit is working on abroadcast radio station!! This means many KW of RF around, many equipments etc. Also building green mic pre with this technique, is quiet like DEATH!!!
see my green updated version:http://www.qsl.net/sv3eao/micpre.htm
radiance
Well-known member
Your stuff looks very pro! The wireing, the housing, it's all perfect.
Right, Mikke.
I never tested or heard with trafos. My project has balanced input, via opa2604AP (replacement of ne5532) and unbalanced output (without trafos).
The best sound that i hear from it , is when input is unbalanced , too. I means that the audio is feeded directly to input pot. That's the way i use .
All about what you like and what you need....
I never tested or heard with trafos. My project has balanced input, via opa2604AP (replacement of ne5532) and unbalanced output (without trafos).
The best sound that i hear from it , is when input is unbalanced , too. I means that the audio is feeded directly to input pot. That's the way i use .
All about what you like and what you need....
About its sound, i think is fantastic. I have never seen or heard the original (only from BF pluggins ), but comparable with my dbx160A is far away better and clear than dbx for my use. I know about trafos effect , but i don't like it so much .
jensenmann
Well-known member
Very nice design. :thumb:
Thanks for the idea of the additional ground plane. Did you use the metal plate on which the PCBs and the transformer are mounted as a ground plane, too ?
Did you use a steelfrontpanel? (I´m asking because aluminium is a poor RF-shield).
Doesn´t add the ground plane on the PCB parasitic capacitance to the circuit?
holy moly, I realize that my poor,little knowledge about RF is totaly gone
cheers
Jens
Thanks for the idea of the additional ground plane. Did you use the metal plate on which the PCBs and the transformer are mounted as a ground plane, too ?
Did you use a steelfrontpanel? (I´m asking because aluminium is a poor RF-shield).
Doesn´t add the ground plane on the PCB parasitic capacitance to the circuit?
holy moly, I realize that my poor,little knowledge about RF is totaly gone
cheers
Jens
Jensenmann, only one point of ground with chassis. The ground plane of boards is separated from chassis with plastic screws. So The point of ground is only at the transformer's point. No steel frontpanel. Ofcourse the extra ground plane adds capacitance to the circuit, but i think that few pf aren't problem to this kind of desigh.
cheers
cheers
:shock: Looks very good indeed. The design somehow reminds me of high-quality measuring tools from late 70'es.. Nice..
Jakob E.
Jakob E.
chrissugar
Well-known member
Very nice looking box. Wiring is neat and tidy.
:thumb:
chrissugar
:thumb:
chrissugar
