Electronics > Beginners

Op amp based preamp supply. Charge pump, single vs symmetrical & ripple

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dazz:

--- Quote from: b_force on November 26, 2018, 02:34:46 pm ---I know 9V is pretty standard, but it's a little unfortunate.
Otherwise it would be pretty easy to use something like a Meanwell MDD01N-15 or similar.
The minimum voltage for those is either 10.8V or maximum voltage for 5.5V (for the 5V version).

The second best choice would be a Meanwell DPAN02A-15 or DPAN02E-15
they also switch at 100kHz, so that can easily be filtered out.
How much opamps/current do you need?

This is the +/- 15V version, which also gives you plenty of headroom.
There are also 12V and 5V version available.

--- End quote ---

It's just a dual opamp (TL082 or LM1458). Maybe 10mA? 20mA tops I think
Off to google those chips too, thanks for the suggestion

b_force:

--- Quote from: dazz on November 26, 2018, 02:41:25 pm ---
--- Quote from: b_force on November 26, 2018, 02:34:46 pm ---I know 9V is pretty standard, but it's a little unfortunate.
Otherwise it would be pretty easy to use something like a Meanwell MDD01N-15 or similar.
The minimum voltage for those is either 10.8V or maximum voltage for 5.5V (for the 5V version).

The second best choice would be a Meanwell DPAN02A-15 or DPAN02E-15
they also switch at 100kHz, so that can easily be filtered out.
How much opamps/current do you need?

This is the +/- 15V version, which also gives you plenty of headroom.
There are also 12V and 5V version available.

--- End quote ---

It's just a dual opamp (TL082 or LM1458). Maybe 10mA? 20mA tops I think
Off to google those chips too, thanks for the suggestion

--- End quote ---
It might be tricky to get these things stable (since some converters have a minimum load needed).

Obviously there are ways to build a circuit from scratch.
I don't know how comfortable you are with soldering SMD stuff?

dazz:

--- Quote from: b_force on November 26, 2018, 02:46:28 pm ---It might be tricky to get these things stable (since some converters have a minimum load needed).

--- End quote ---

They're also pretty expensive at $10 or so. And would make the pcb a lot larger too. I'm trying to fit this thing in a 1590BB enclosure


--- Quote from: b_force on November 26, 2018, 02:46:28 pm ---Obviously there are ways to build a circuit from scratch.
I don't know how comfortable you are with soldering SMD stuff?

--- End quote ---

I've only soldered SOT23 jfets, LOL. But I don't mind trying something else if needed be.
The thing is that this will be a DIY thing that I will publish, and most people prefer through hole since it's easier to assemble.

But I'm very interested in how the circuit could be rebuilt to perform the same with a lower power supply. So if you could give me some pointers that would be very much appreciated

b_force:

--- Quote from: dazz on November 26, 2018, 02:54:47 pm ---
--- Quote from: b_force on November 26, 2018, 02:46:28 pm ---It might be tricky to get these things stable (since some converters have a minimum load needed).

--- End quote ---

They're also pretty expensive at $10 or so. And would make the pcb a lot larger too. I'm trying to fit this thing in a 1590BB enclosure


--- Quote from: b_force on November 26, 2018, 02:46:28 pm ---Obviously there are ways to build a circuit from scratch.
I don't know how comfortable you are with soldering SMD stuff?

--- End quote ---

I've only solder SOT23 jfets, LOL. But I don't mind trying something else if needed be.
The thing is that this will be a DIY thing that I will publish, and most people prefer through hole since it's easier to assemble.

But I'm very interested in how the circuit could be rebuilt to perform the same with a lower power supply

--- End quote ---
10 bucks? Well, that's a pretty bad deal, I normally buy them for around $4-6
Which isn't that much more expensive compared to developing your own stuff.

Another idea i to get a basic 9-12 or 9-15 boost converter and use a flyback or 1:1 coupled inductor to form the negative voltage.

dazz:

--- Quote from: b_force on November 26, 2018, 03:01:05 pm ---Another idea i to get a basic 9-12 or 9-15 boost converter and use a flyback or 1:1 coupled inductor to form the negative voltage.

--- End quote ---

Yeah, I already have one of those boards I got from ebay. Maybe I could add a boost converter to my board. Something based on a LM2577-adj perhaps? Ideally something that can be got for cheap off ebay or the likes

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