diytube.com

burnedfingers wrote:
I think you are more than a diyer. This is a ad if I've ever seen one.

If an ad to sell you have not seen PCB inside and schematics,OPT...it is very bad and unprofessional

I am a true DIYer,amplifier ST70 my clone not sell

inside the amplifier using: digital volume control,selector 5 input,display LED 7-segment,...

Schematic front panel

Pga2310


Selector input

PCB Front panel




PCB Real panel

PCB main ST70

quote:
I am a true DIYer,amplifier ST70 my clone not sell


Ok... If so then why plaster your schematic and board pictures on the thread? It really looks like an ad. At the bottom you have :

Skype:nguyenhien2006
...looking for work... Makes me think that you are trolling for some type of PCB board work and that make me think of an ad.


I'll tell you what I think of it......

1) I like the chassis
2) I like the transformer

3) I don't like the circuit (driver)
4) I'm not partial to putting a digital volume control and any tube piece.

But if you like it then thats all that matters. I can see that you put alot of work into it and I can relate to the effort.

Ultraline -

Is the volume control a motorized pot driven by an H-Bridge ?

I built a preamp using the boards from eBay for relay input
selector and on-board motorized pot. I added an external
driver for a Nixie tube to show the position of the input
selector, but didn't do anything for the volume control.

Cool stuff - thanks for posting the schematics.

... tom

TomMcNally wrote:Ultraline -

Is the volume control a motorized pot driven by an H-Bridge ?

I built a preamp using the boards from eBay for relay input
selector and on-board motorized pot. I added an external
driver for a Nixie tube to show the position of the input
selector, but didn't do anything for the volume control.

Cool stuff - thanks for posting the schematics.

... tom

No,this is digital volume control.

Inside IC PGA2310 has the resistors connected and multiple SW.
You turn pot volume on front panel is CPU will control the SW inside the PGA2310 to select the appropriate volume.

burnedfingers wrote:Ok... If so then why plaster your schematic and board pictures on the thread? It really looks like an ad. At the bottom you have :

Skype:nguyenhien2006
...looking for work... Makes me think that you are trolling for some type of PCB board work and that make me think of an ad.


I'll tell you what I think of it......

1) I like the chassis
2) I like the transformer

3) I don't like the circuit (driver)
4) I'm not partial to putting a digital volume control and any tube piece.

But if you like it then thats all that matters. I can see that you put alot of work into it and I can relate to the effort.

Ok,I am unemployment, I do not have a job, I have very much free time so I made ​​DIY to fun.

burnedfingers wrote:4) I'm not partial to putting a digital volume control and any tube piece.

Wasn't there a R2R volume control (obsolete, of course) that was really low noise that was good for tube amps?

Cheers!