" My ultra- complex design " have distance between input and output only 9 cm, Carlos, not 1 km.... 😉
alternative for 2sk3xx FET?
Hello
Which fets could be used instead of given ones in the diff-Input stage?
Please give me any advice?!
Greetings.
Hello
Which fets could be used instead of given ones in the diff-Input stage?
Please give me any advice?!
Greetings.
PSu question
Hello
if one would like to build the DoGC in classAB like the shem in the first post.
Why are there two solderpoints each to attach the supplyvoltage? Schould the voltage for the BDs be filter by the Inductor, or what?
Thank you very much for your answer!
lastly: Is it a reliable design, or is it complex the bring it to life (maybe oszillation, big component tolerances etc.)-not criticising your design, just asking, as I tried many designs that were a bit tricky.
Greetings!
Hello
if one would like to build the DoGC in classAB like the shem in the first post.
Why are there two solderpoints each to attach the supplyvoltage? Schould the voltage for the BDs be filter by the Inductor, or what?
Thank you very much for your answer!
lastly: Is it a reliable design, or is it complex the bring it to life (maybe oszillation, big component tolerances etc.)-not criticising your design, just asking, as I tried many designs that were a bit tricky.
Greetings!
Re: PSu question
There are two points for supply voltage - one for class B (BDs) and one
(with inductors) for class A - diff and IRF9610/620.
As you see on attached picture, there is an option for one PS.
Resistors in bridge are 1% - 2x1k and 47 ohms...
The most important part is inductor, make it carefully!
120pF is Wima, 5% tolerance.
I made (and many people made too) a lot of DoGCs here, in Bulgaria...
The project is enough old, it started in the beginning of 2005.
Possible substitutions:
2SK170BL, 2SK117BL, 2SK364/369BL or V...
There is one condition:
Id=9-10mA(or more) @ Ugs=0V
BlacK_Chicken said:
There are two points for supply voltage - one for class B (BDs) and one
(with inductors) for class A - diff and IRF9610/620.
As you see on attached picture, there is an option for one PS.
Resistors in bridge are 1% - 2x1k and 47 ohms...
The most important part is inductor, make it carefully!
120pF is Wima, 5% tolerance.
I made (and many people made too) a lot of DoGCs here, in Bulgaria...
The project is enough old, it started in the beginning of 2005.
Possible substitutions:
2SK170BL, 2SK117BL, 2SK364/369BL or V...
There is one condition:
Id=9-10mA(or more) @ Ugs=0V
Attachments
Hello
so I may add the jumpers and use the amp with a normal (non-inductive) Power supply? Like it is shown in the shematic?
Or are the Fets running in Class A all the time and the BDs runnig in class B at the same time? this makes no sense to me.
thank you for the substitudes!
so I may add the jumpers and use the amp with a normal (non-inductive) Power supply? Like it is shown in the shematic?
Or are the Fets running in Class A all the time and the BDs runnig in class B at the same time? this makes no sense to me.
thank you for the substitudes!
Twin power supply eliminates pulsations in PS for input stages caused by the collector current peaks of dumpers @ high (not only) output power...
I also would like some pcb's. I have some gainclones sitting idle that I could I can use the exhisting chassis and trafo.s Now it seems I will be building 3 more amps; and then?
Cheers
doggy 🙂
Cheers
doggy 🙂
I was considering building this amp, but searching for components in my Farnell cat. drew a blank on both the bipolar output transistors and the input fets. Couldn't find anything that came near to the hte of the output transistors.
A kit of parts could be a nice little earner, that is if they are as cheap as you claim in your neck of the woods.
Shoog
A kit of parts could be a nice little earner, that is if they are as cheap as you claim in your neck of the woods.
Shoog
I wonder if MJE150XX would work. I see no reason why not but as I don't get a full grip on the schematic I'm a bit in the dark on substitutes.
/Hugo
/Hugo
Dear Widowmaker,
have you tried the DOGC with "better" (so faster, more linear, for example 2sc5200/2sa1943) op devices.
Anyway I don't think, your amp will kick the GC. Because the GC is not preferred by sound of that: people like them, because requoires minimal parts, and it operates with a chip. And the "47LAB" is sounds good, as the father of the GC...
So sorry, but I think your design won't be as famous as GC. And the strongest in the GC-story: it's famous...
Regards,
PS.: Anyway I don't think GC is a good amp... It's good for a lot of audiofil diyer, but for me: not enough good.
have you tried the DOGC with "better" (so faster, more linear, for example 2sc5200/2sa1943) op devices.
Anyway I don't think, your amp will kick the GC. Because the GC is not preferred by sound of that: people like them, because requoires minimal parts, and it operates with a chip. And the "47LAB" is sounds good, as the father of the GC...
So sorry, but I think your design won't be as famous as GC. And the strongest in the GC-story: it's famous...
Regards,
PS.: Anyway I don't think GC is a good amp... It's good for a lot of audiofil diyer, but for me: not enough good.