Products > Test Equipment
Power Supply: Build or Buy?
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br4n_d0n:

--- Quote from: 5U4GB on May 08, 2023, 09:14:45 am ---I realise there's a bit more than an LM723+2N3055 in there, but does that really justify a four-digit price for a dual 0-32V 3A PSU?

--- End quote ---

This is exactly what I'm talking about; I highly doubt the parts and all that amount to even half the price of these "higher end" brands. Seems like huge price gouging to me, but I'm new to this so...
gjvdheiden:

--- Quote from: 5U4GB on May 08, 2023, 10:24:02 am ---
--- Quote from: gjvdheiden on May 08, 2023, 09:50:14 am ---There's a new one out, Korad KA3005PS. Suppose to have less noise according to the advertisement.
--- End quote ---

Is the -PS a custom version of the -P for Eleshop?  That seems to be the only place that carries it, even the Korad product page doesn't mention it.

--- End quote ---

I did got the info from Eleshop, but they seem to carry to versions. KA3005PS, which according to Eleshop is just a new version and then the KA3005PE-AN. The latter is an Eleshop only version.

The knob seems a little bit better too.
gjvdheiden:

--- Quote from: br4n_d0n on May 08, 2023, 12:24:26 pm ---
--- Quote from: 5U4GB on May 08, 2023, 09:14:45 am ---I realise there's a bit more than an LM723+2N3055 in there, but does that really justify a four-digit price for a dual 0-32V 3A PSU?

--- End quote ---

This is exactly what I'm talking about; I highly doubt the parts and all that amount to even half the price of these "higher end" brands. Seems like huge price gouging to me, but I'm new to this so...

--- End quote ---

5U4GB was talking about a Rigol. These usually are built to a price. The only 4 digit Rigol I can find is the Rigol DP2031. Just over 1300 euro. That thing can do arbitraty waveforms, 1mV/1uA precision, 10A max per channel (banner specs), has a TFT, various control inputs and then some. I don't think I could built that cheaper myself. You pay, you get.
Fungus:

--- Quote from: tooki on May 08, 2023, 07:46:42 am ---Indeed, I’ve had great experiences with Mean Well, too.

But why suggest buying on aliexpress? Mean Well is sold by all the major distributors (ensuring it’s genuine) at lower prices.

--- End quote ---

I don't want to recommend any particular distributor.

It's also going to depend on where you live...  :-//
mawyatt:
The first thing to consider for a newcomer to electronics is how many channels and what voltage current levels are necessary. As all of us at one time were newcomers "been there done that" and quickly found out for general purpose work dual channels is a must, at minimum +-20V at 1A.

We also found out that all switching PSs make additional noise above a linear type, some are so bad as almost useless for anything other that driving a motor!! Altho some recent quality switching PS are not too bad and could be useful for even some analog type work.

The additional cost one finds in a quality lab/bench type PS like the mentioned Rigol (and others) is they are linear types, use of torrid type transformers (low magnetic field leakage), multiple independent channels, very low output noise levels, utilize precision DACs and ADCs so the outputs are spot on (both voltage and current), don't have turn ON or OFF overshoot/undershoot (disastrous for sensitive semiconductors), behave nicely when engaging Over Current or Voltage limits, easy to read digital displays (some have/allow much larger fonts) and have multiple means to remotely communicate.

All these features cost in design time, assembly, components (and customer service) and this is reflected in the end user cost.

Since most of us have "been there done that", a wise newcomer would learn from others and select a PS that's linear and has a couple outputs capable of producing clean accurate voltages and currents, maybe +-20V and 1A from a reputable OEM source (or used).

One thing a newcomer may not recognize, but will quickly learn (usually the hard way!!), everything in electronics starts with the Power Supply, wether a Battery, Mains PS or Solar Source, and a cheap, noisy, inaccurate PS soon finds its way to the trash. This is especially true as one gains knowledge in electronics and becomes "seasoned" :-+ 

Best,
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