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What Volts and Amps power supply should I look for
What Volts and Amps power supply should I look for
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Old 26th July 2019, 03:00 PM   #1
djn is offline djn  United States
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Default What Volts and Amps power supply should I look for

Hi guys,

What size power supply should I look for? Actually I'm not sure what a power supply is used for on a work bench.
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Old 26th July 2019, 03:09 PM   #2
FauxFrench is online now FauxFrench  France
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The values for a bench power supply depend very much on the type of constructions you make. Very often you start with a 0-30V or 0-40V bench supply with some 2-3Amp capacity. They are not expensive. If you make amplifiers that need symmetrical voltages, then you can find symmetrical bench supplies but the price goes up. Depending on the amount you want to spend, a capacity of 5Amp is nice to have.

Do not expect that your bench supply can handle any voltage and current you may need in the future.
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Old 26th July 2019, 04:13 PM   #3
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by djn View Post
Actually I'm not sure what a power supply is used for on a work bench.
Experimenting If you just want to build projects then build power supplies as you need them.
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Old 26th July 2019, 05:11 PM   #4
w5jag is online now w5jag  United States
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A good start:

For tubes: old greifkits, Knight, etc., typically have a 6 volt heater line, adjustable bias, and adjustable regulated high voltage all in one box. These are inexpensive and a good way to go, imo.

If you are only going to work with solid state, 0-30 or 0-60 VDC would probably be okay. I have some that go up to 50 amps, some as small as a couple of amps. Depends on what you need them to do. A 3 or 5 amp supply would probably be okay to start with. At some point, you might also need a negative supply.

On or around my bench I have separate supplies providing 0 - 15 VDC; 0-30 VDC; 0-150 VDC, 0-400 VDC, and negative 0 - 125 VDC. I can improvise up to 900 VDC or so. It helps to have multiple supplies, as it is common to need different voltages simultaneously.

Adjustable output current limiting is also a useful feature.

You might also want to think about getting a variable transformer that can reduce your AC line voltage. These are typically called Variacs.

Hope this helps.
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Old 27th July 2019, 05:31 PM   #5
djn is offline djn  United States
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I just pick up this for 40 bucks
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Old 4th August 2019, 07:31 PM   #6
nigelwright7557 is offline nigelwright7557  United Kingdom
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I built an amplifier test bed.
It has a power supply and crocodile clips on flying leads for applying power to pcb's.
On the output is a DC protection circuit so I don't fry my speakers.
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