50 ma........why not batteries.

Battery will be about 8.45v..9v

 

What will you do when you need the generator to drive the circuit that your signal generator is supplying power too?

 

It’s the same as positive side just reversed. Follow the diagram. 50mA might be too much.

 

What will you do when you need the generator to drive the circuit that your signal generator is supplying power too?

lol..The generator has 2 outputs...speaking of two outputs (thanks)..How to get this?

I used two outputs with different frequencies but in parallel, it works...Am I not disappointing Kirchoff by doing this? vpp have to be the same..Dont want to lose my function generator

Is there another way to get the pic in the image

 

It’s the same as positive side just reversed. Follow the diagram. 50mA might be too much.

Don't understand the -15 part unfortunately...Anyways, will try again to understand

 

You mean you want that, most of us throw that stuff away.

 

Is this a homework assignment?

 

The negative comes from the diode and capacitor polarity.

 

You mean you want that, most of us throw that stuff away.

hehe..Yeah..I am trying to get it from generator then make filter to pick up either the fast or the 1khz

 

Is this a homework assignment?

No..Learning from a book.

 

What does the book say? Any load on that circuit will drop the voltages... might be ok for a mosfet gate voltage tho...

 

What does the book say? Any load on that circuit will drop the voltages... might be ok for a mosfet gate voltage tho...

I will use zener then transistor..near constant v and I?

 

OK sounds like you know better... let me know how it goes.

 

OK sounds like you know better... let me know how it goes.

lol..I know nothing..I tried earlier today, used 3 5.6v zeners and transistor and used 1M ohm as load..5v/div..did not seem to move but looked like ripple : stupid me did not adjust time div to see ripple...

 

Sounds like you're having fun...

 

If you have it working, measure the voltages across the capacitors, and be sure the capacitors are oriented properly. I could have marked them, but I didn't and I didn't save the schematic to edit it.

If you need more output, increasing the value of the 10 uF caps might help. Increasing the 100 uF and/or using a higher frequency will reduce the ripple.

 

The issue is the source is about 100mA at best. Divide for voltage doubler and divide for each half. But even with more source current it’s not possible to hold the voltage with a load using that circuit

 

Thanks but where will the 30 come from? the extra volts

I thought you were looking for a way to amplify a signal from your function generator from 20V to 30V. A cheap, mains-powered audio amp would easily do this for the proper frequency range.

Apparently you're doing something else, which I still don't understand.

Are you trying to power some op-amp or other IC that supposedly needs a ±15V power supply? Tell us what you really want to accomplish and what you are starting with.

 

I thought you were looking for a way to amplify a signal from your function generator from 20V to 30V. A cheap, mains-powered audio amp would easily do this for the proper frequency range.

Apparently you're doing something else, which I still don't understand.

Are you trying to power some op-amp or other IC that supposedly needs a ±15V power supply? Tell us what you really want to accomplish and what you are starting with.

Yeah I'm trying to power up op amp and transistors that need +-15 dc...needed to use the function generator with capacitors and diodes to get this... I wasn't clear yeah... Yill above provided the solution

 

Yill above provided the solution

That's A solution that comes with serious shortcomings, particularly current capacity. If it works for you, fine.