Electronics > Beginners
Can I power this 6V preamp from 12V?
<< < (3/5) > >>
Simon:
Just use linear voltage regulators to drop 12v to 6V, this will also clean up switching noise from the SMPS. A PC PSU does not provide much -12V paver.
ogden:
Input and output of this amp have DC blocking capacitors, circuit does not have ground connection whatsoever. It means that indeed it can be powered from single, unipolar +12V supply (leaving -12V rail alone). Connect +6 to +12 and -6 to ground, done.
tooki:

--- Quote from: ELS122 on October 14, 2019, 12:05:15 pm ---Before yes! I got great help but you just ‘helped’ me whit the title. And did I need to title this post as ‘would this unidentified circuit I found on google while looking for something else work?’ If so  :-DD

--- End quote ---
Huh? I think someone is a few beers short of a six-pack...
Rigolon:

--- Quote from: Gyro on October 13, 2019, 04:53:57 pm ---The supply voltage markings are deceptive, it only requires a single +6V supply. The line marked 6V- is ground, both for the supply and for the input and output.

--- End quote ---

I'm not very experienced yet, could you help me understand what made you think that? I don't see a problem with being +6V to -6V rails. It looks like a part of a bigger circuit where they had those voltage levels to use. For me I would think that they wanted a 12V potential difference, but didn't have the 12V or didn't want to use the ground rail for some reason... I don't really know how could you be so certain that it's +6V to GND.


--- Quote from: ELS122 on October 14, 2019, 11:41:22 am ---Thanks for the help... not! That means that it’s the forum fault. So I need to like imagine what could your brain would process normally as a title and wouldn’t click it in to ‘cocky’ mode!

--- End quote ---
Ok... so maybe you felt people were a little aggressive, or so to say. But they do have a point. I guess it should be better to try and filter the information (the comments that help you understand the community and how optimize the way the forum is used)  and ignore the rest (the aggressive behavior). I believe everyone here wants the best for the forum and to help each other.
There are a lot of replies here that just don't add anything.

That being said, I'm not experienced and don't know how Gyro and Soldar got to know that -6V is actually just ground. But I would believe that the schematics are right, so the potential difference there is 12V... As you do want to use a 12V power supply, I would test the circuit with +12V in the +6V line and ground to the -6V line. I would also try what Gyro and Soldar said about just using ground to the -6V line and see if it works out.

Try it out and let us know.

Just to empathize, any modification you make try to upload schematics and pictures, it always help to solve the problem faster.
soldar:

--- Quote from: Rigolon on October 14, 2019, 08:57:13 pm ---That being said, I'm not experienced and don't know how Gyro and Soldar got to know that -6V is actually just ground. But I would believe that the schematics are right, so the potential difference there is 12V... As you do want to use a 12V power supply, I would test the circuit with +12V in the +6V line and ground to the -6V line. I would also try what Gyro and Soldar said about just using ground to the -6V line and see if it works out.
--- End quote ---

Nowhere in the schematic does it say "-6V". That's your clue right there. The schematic does not have two points, one labeled "+6V" and the other "-6V", and even then it could be a single 6V supply.

The way it is drawn, with a thicker line for negative, clearly indicates that is ground.

That schematic is at least 25 years old and I have been reading schematics for decades. I interpret that to be a single 6 V supply. I would bet that was designed for 6V operation and calculating operating currents would confirm it even though it should have a very wide range and probably operates well at 12 V.

It also does not look like the best design. Maybe someone would want to model it in LTSpice and see the response.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod