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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Cheap and cheerful bench power supply
I'm looking for a cheap and cheerful bench power supply. Here are the
desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC The last three are not deal-breakers though. I've seen a few on eBay, but am not certain about quality. Like this: http://www.ebay.com.au/itm/Dr-Meter-...em338dca 9adf It would be nice to find one here in Australia, but 30-0-30 seems to be the limit for the popular choices. -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#2
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Cheap and cheerful bench power supply
On 11/06/2015 1:58 PM, Trevor Wilson wrote:
I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC The last three are not deal-breakers though. I've seen a few on eBay, but am not certain about quality. Like this: http://www.ebay.com.au/itm/Dr-Meter-...em338dca 9adf It would be nice to find one here in Australia, but 30-0-30 seems to be the limit for the popular choices. **I found this at Element14: http://au.element14.com/tenma/72-105...ble/dp/2251948 I wonder how difficult it would be to hack two of these to provide tracking: https://www.rockby.com.au/Rockby/Mai...87_1.htm#42287 I imagine that Wavecom is the manufacturer for Tenma. Possibly someone has hacked these things? -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#3
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Cheap and cheerful bench power supply
On Thursday, June 11, 2015 at 12:00:30 AM UTC-4, Trevor Wilson wrote:
I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC The last three are not deal-breakers though. I've seen a few on eBay, but am not certain about quality. Like this: http://www.ebay.com.au/itm/Dr-Meter-...em338dca 9adf It would be nice to find one here in Australia, but 30-0-30 seems to be the limit for the popular choices. -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus I would want my bench power supply to be as quiet as possible. Who cares about efficiency when you're designing and powering up a prototype. You may wind up with a switcher in the final design but I would definitely not get a switcher frr new product evaluation. Lenny. |
#5
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Cheap and cheerful bench power supply
Trevor Wilson wrote:
I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC ** All you need is one of these: http://product-images.highwire.com/5569873/7432-6.jpg plus a couple of 1.5V cells. Gives you a dual tracking supply of 0 to +60V and -60V with single knob control and heaps of current available. Hint: you switch the amp to "bridge" first. .... Phil |
#6
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Cheap and cheerful bench power supply
On 14/06/2015 9:43 PM, Phil Allison wrote:
Trevor Wilson wrote: I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC ** All you need is one of these: http://product-images.highwire.com/5569873/7432-6.jpg plus a couple of 1.5V cells. Gives you a dual tracking supply of 0 to +60V and -60V with single knob control and heaps of current available. Hint: you switch the amp to "bridge" first. **Nice idea, except I require variable current limiting as well. I wanted to avoid a DIY exercise. In any case, I've pretty much decided that a 30-0-30 @ 5A supply will do for the present time. 200 Bucks from Rockby. -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#7
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Cheap and cheerful bench power supply
"Phil Allison" wrote in message ... Trevor Wilson wrote: I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC ** All you need is one of these: http://product-images.highwire.com/5569873/7432-6.jpg plus a couple of 1.5V cells. Gives you a dual tracking supply of 0 to +60V and -60V with single knob control and heaps of current available. Hint: you switch the amp to "bridge" first. I had a very painful learning experience with one of these amps, in my very early days of repairing stuff. I'd repaired it, tested fine on the bench. Then reassembled it, stupidly without re-testing it. Turns out I'd used a screw somewhere near the mains switch that was slightly too long. Caused a short, caused both outputs to become DC. Gave it back to the customer, he connected it to a pair of these: http://spurwinkproductions.com/Edit%...res/813C_1.jpg Fried all 4 cones. Since then, nothing ever leaves my workshop without a final test, fully assembled, ready to go. Gareth. |
#8
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Cheap and cheerful bench power supply
Gareth Magennis wrote:
Since then, nothing ever leaves my workshop without a final test, fully assembled, ready to go. ** Had a customer once who decided it was perfectly OK to bring just the chassis from his combo amp in for service, with the valves removed and packed separately. He wanted it back that way too. He was not a customer for long. Final testing is when you often find new, unreported faults and any errors made during servicing. .... Phil |
#9
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Cheap and cheerful bench power supply
On 15/06/2015 1:03 PM, Phil Allison wrote:
Gareth Magennis wrote: Since then, nothing ever leaves my workshop without a final test, fully assembled, ready to go. ** Had a customer once who decided it was perfectly OK to bring just the chassis from his combo amp in for service, with the valves removed and packed separately. He wanted it back that way too. He was not a customer for long. Final testing is when you often find new, unreported faults and any errors made during servicing. **Indeed. It is crucial to any decent service job. For any decent product which hits my bench, it is subject to significant under-load testing, to reasonable operating temps, plus basic performance tests to verify operation. For some amps, that can mean several hours of testing. Particularly those with several tens of kg of heat sinking. Even the cheapest, crappiest amp that lands on my bench is tested for basic performance before leaving. Anything less can be a costly mistake. Nothing worse than a customer who brings in a box full of parts, asking for me to fix it. -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#10
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Cheap and cheerful bench power supply
Phil Allison wrote:
Trevor Wilson wrote: I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC ** All you need is one of these: http://product-images.highwire.com/5569873/7432-6.jpg plus a couple of 1.5V cells. Gives you a dual tracking supply of 0 to +60V and -60V with single knob control and heaps of current available. Hint: you switch the amp to "bridge" first. ... Phil Got to remember that.. Greg |
#11
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Cheap and cheerful bench power supply
GS wrote:
** All you need is one of these: http://product-images.highwire.com/5569873/7432-6.jpg plus a couple of 1.5V cells. Gives you a dual tracking supply of 0 to +60V and -60V with single knob control and heaps of current available. Hint: you switch the amp to "bridge" first. Got to remember that.. ** You could use the same idea with most dual channel power amps, long as you restore full gain at DC by removing input and feedback loop electros. .... Phil |
#12
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Cheap and cheerful bench power supply
On Thursday, June 11, 2015 at 12:00:30 AM UTC-4, Trevor Wilson wrote:
I'm looking for a cheap and cheerful bench power supply. Here are the desired specs: 50-0-50 Volts, variable. 0-3 Amps, variable. Tracking Ideally, I would like: 0-5 Amps Linear rather than SMPS 230/240VAC The last three are not deal-breakers though. I've seen a few on eBay, but am not certain about quality. Like this: http://www.ebay.com.au/itm/Dr-Meter-...em338dca 9adf I think there is one place in China making all those and re-branding them. We buy them from Mastek. http://www.mastechpowersupply.com/ The ones we get now say Volteq on the label. George H. It would be nice to find one here in Australia, but 30-0-30 seems to be the limit for the popular choices. -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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