About This is more of a review than anything else. After looking at designing a circuit based on the LM317T for a variable PSU and pricing up the parts, it was obvious that buying a kit from China for the bargain price of £1.98 was the way to go.
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LM317 Adjustable Regulated Voltage Step-down Power Supply Suite Module DIY Kit £1.98 |
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LED Panel Meter DC 3V To 30V DC 0-100V 10A Dual Digital Voltmeter Ammeter 35DI £3.06 |
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2 Speaker Socket Panel Mount Amplifier Terminal Binding Post for 4mm Banana Plug
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1 Set Alligator Test Lead Clip To Banana Plug Probe Cable 100CM 1M Red + Black |
An old PC PSU case was perfect for the circuit. Some sawing and drilling later completed the enclosure. |
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| Unfortuntely after a few weeks the PSU failed at which point I threw the towel in. I didn't even attempt to repair it and looked for a proper bench power supply to purchase. | |
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Maisheng MS-305D. I purchased this somewhere around 2015 for £35 on eBay. The unit has worked perfectly since day 1 and is still the PSU I use today.
It came with mains lead (kettle style) and a lead for the front with banana clips to connect, and crocodile clips on the other end. One thing I noticed about that lead straight away was the cable was very flimsy and would never carry the current that the PSU was capable of supplying. So I basically removed the ends and soldered them onto twin flat flex mains cable. |
Ironically around 12 months later, I saw a YouTube video on Big Clives channel about one of these bench power supplies setting on fire. On later inspection, it had turned out to be the same cable that was supplied with the PSU. A viewer had left it on running a peltier module. They sent in photos to Big Clive. |
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