Re: Anyone figured out where the schematic file is?
I'm not talking about an image or pdf of a schematic, I'm talking about an actual .sch file used by Eagle. I KNOW that that schematic was made in Eagle. I use Eagle and that image has the same look as Eagle does.
loek said:
I'm not talking about an image or pdf of a schematic, I'm talking about an actual .sch file used by Eagle. I KNOW that that schematic was made in Eagle. I use Eagle and that image has the same look as Eagle does.
No, I never built a amp with THIS pcb.
Of course, there must be a resistor from grid to ground! The circuit is intended for a pot at the input (47k) wich fullfills this function.
Kind regards
Franz
BTW: I just checked the mini VBITNGC from my friend: he realized a scratching pot. Reason: no anode voltage, blown F1 fuse. But the amp worked...
Anyone interested in a kit?
Hi
I have put together kits for other DIY projects, including one for another board that Digi made (SOHA v.3). Is there any interest in a kit to build this amp? I really like hybrids, and also like gain clones so this would be a fun project for me.
I would be able to offer a discount over buying the parts individually.
Hope I'm not too late.
Jeff
Hi
I have put together kits for other DIY projects, including one for another board that Digi made (SOHA v.3). Is there any interest in a kit to build this amp? I really like hybrids, and also like gain clones so this would be a fun project for me.
I would be able to offer a discount over buying the parts individually.
Hope I'm not too late.
Jeff
Nice- has anyone around here actually built one using these boards? I've dug through the threads a little but couldn't quite tell what people were up to.
If so, can all the parts be sourced from the usual Digikey/Mouser/Parts Express or are there more specialty suppliers that would be recommended?
If so, can all the parts be sourced from the usual Digikey/Mouser/Parts Express or are there more specialty suppliers that would be recommended?
For those who are interested: i have some original "GEWA" VBITNGC boards for sale. I have too many other projects, and the summer is comming up, so little time for making amps.
I build 1 VBITNGC myself, and it works fine.
I also can sell the boards with the tubes (E88CC), relais and LM3875TF.
It speaks for itself that i sell the boards non profit (original price).
I build 1 VBITNGC myself, and it works fine.
I also can sell the boards with the tubes (E88CC), relais and LM3875TF.
It speaks for itself that i sell the boards non profit (original price).
Hey guys these are very easy to build very nice sounding valve buffered integrated gainclones... (you don't need a preamp).
It was one of my first projects and it came out just fine... took a long time for me building stuff, to beat its level of performance...
The GEWA boards are the ones that were cooperatively designed here Wim? If so, these should be even easier, as it had input from many people, sorting out lots of potential small hassles and personal taste issues...
Groette
Nico
It was one of my first projects and it came out just fine... took a long time for me building stuff, to beat its level of performance...
The GEWA boards are the ones that were cooperatively designed here Wim? If so, these should be even easier, as it had input from many people, sorting out lots of potential small hassles and personal taste issues...
Groette
Nico
Yes Nordic, these are the boards that were cooperatively designed on this forum. It has a good BOM and manual on the forum.
What's the influence of the value of the capacitor C105 on the sound?
More biger capacitor more bass?
C20 is 10uF ELCO R9 is 120 ?
TNX for quick reply.
ErrHec
More biger capacitor more bass?
C20 is 10uF ELCO R9 is 120 ?
TNX for quick reply.
ErrHec
Firstly it is there to block the DC component from the valve output..., secondly it forms part of a lowpass filter, so increasing the capacitance will change the knee of the frequency response to be lower, inreasing the voltage would probably reduce esr a bit, but it will increase the cost and will be larger.
C20 you could go for 10 to 100uf, exceeding that may cause problems for the reg, according to the datasheet.
R9 is 120R is correct
the output beween the 2 pins of the regulator that it connects, try to maintain a voltage of about 1.25V there... the datasheet suggests a minimum load of about 10mA, 1.25/120 = 10mA
C20 you could go for 10 to 100uf, exceeding that may cause problems for the reg, according to the datasheet.
R9 is 120R is correct
the output beween the 2 pins of the regulator that it connects, try to maintain a voltage of about 1.25V there... the datasheet suggests a minimum load of about 10mA, 1.25/120 = 10mA
🙂
Me again.
The copmpany send me the wrong capacitors ( C1-C8; C13-C14)
They send me 100nF/50V instead of 100nF/100V
But it should be ok, since the supply voltage is 25V ( max) what it came
36V DC?
Could i use it or is better to be at least 63V??
Thank you
ErrHec
Me again.
The copmpany send me the wrong capacitors ( C1-C8; C13-C14)
They send me 100nF/50V instead of 100nF/100V
But it should be ok, since the supply voltage is 25V ( max) what it came
36V DC?
Could i use it or is better to be at least 63V??
Thank you
ErrHec
I build mine with a greinacher voltage doubler and a 24V pcb mount transformer... but if you are running 35V rails, 50V should be fine. I think the electrolytics are 50V too...
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