Timeline for Wondering how to get inexpensive 10 mA power supplies for electrochemistry
Current License: CC BY-SA 4.0
24 events
| when toggle format | what | by | license | comment | |
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| Mar 7, 2019 at 22:50 | history | edited | W5VO |
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| Jul 8, 2018 at 8:44 | comment | added | user57037 | If you need 25V, the 12V supply you linked to will not be a good choice. It will be much easier if you don't need to boost voltage. So look for some kind of supply that can produce 30V and use the ideas elsewhere in this thread. | |
| Jul 7, 2018 at 20:34 | comment | added | BenAndo | Answered questions about voltages and some chem details. Thanks all. | |
| Jul 7, 2018 at 20:33 | history | edited | BenAndo | CC BY-SA 4.0 |
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| Jul 7, 2018 at 20:25 | history | edited | BenAndo | CC BY-SA 4.0 |
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| Jul 7, 2018 at 20:02 | comment | added | Robert Endl | Meter: Beware the $10 bargain DVMs but any decent meter will work fine. I love Fluke, but the good Chinese meters have gotten better and better. | |
| Jul 7, 2018 at 15:56 | comment | added | JRE | @WhatRoughBeast: It says the lowest current for proper regulation is 5mA (typical) 10mA(worst case). So, most of the time a 10mA regulator built from an LM317 ought to work - except when it doesn't. | |
| Jul 7, 2018 at 14:15 | answer | added | D.A.S. | timeline score: 3 | |
| Jul 7, 2018 at 13:42 | comment | added | WhatRoughBeast | @JRE - The data sheet gives 5 mA as a lower limit for using the 317 as a current source. | |
| Jul 7, 2018 at 12:46 | review | Close votes | |||
| Jul 12, 2018 at 3:01 | |||||
| Jul 7, 2018 at 4:10 | comment | added | Neil_UK | You have two answers with good suggestions, for LM317, and for LT3042, both will work in your application. The former costs pennies, the latter costs pounds, that may help your choice. | |
| Jul 7, 2018 at 3:49 | comment | added | Steve | How much power do you need to deliver? | |
| Jul 7, 2018 at 2:52 | history | tweeted | twitter.com/StackElectronix/status/1015428380685107200 | ||
| Jul 7, 2018 at 1:39 | comment | added | JRE | The LM317 requires about 3V difference between input and output to operate. This reduces your working voltage range to 9V, and the maximum resistance to 900 ohm. Also, 10mA is at the lower limit of its range. It might not regulate well. The LT3042 only loses a few hundred millivolts from input tp output, leaving with over 11V and over 1100 ohms. It is also designed for low current use. | |
| Jul 7, 2018 at 1:29 | comment | added | JRE | It would appear that 10V is a starting point. Commercial units operate at 10V. 30V appears to be the maximum. So at 10V, the expected resistance is therefore less than 1000ohm (10V) or less than 3000 ohm (30V) | |
| Jul 7, 2018 at 1:08 | comment | added | Ale..chenski | Any DMM in current mode will give you pretty accurate readings, since the "burden voltage" will be negligible relative to supply voltage. | |
| Jul 6, 2018 at 23:04 | comment | added | user57037 | Can you please edit your question to include an answer to @W5VO's question in the first comment? This could have an effect on the answer. | |
| Jul 6, 2018 at 22:37 | answer | added | WhatRoughBeast | timeline score: 10 | |
| Jul 6, 2018 at 21:55 | comment | added | Spehro 'speff' Pefhany | If you can have one common terminal (one side of the current sources or sinks) you can use one power supply and many simple current regulators. | |
| Jul 6, 2018 at 21:42 | answer | added | Voltage Spike♦ | timeline score: 8 | |
| Jul 6, 2018 at 21:34 | comment | added | Nick Alexeev | (1) Vast majority of consumer power supplies are constant voltage. The only type of consumer power supplies with constant current output that comes to mind are LED power supplies. (2) Could you describe your electrochemistry experiment in more details, please? (3) I'd like to second the question about the range of voltages. | |
| Jul 6, 2018 at 21:21 | comment | added | W5VO | What range of voltages/resistances do you expect? | |
| Jul 6, 2018 at 21:19 | review | First posts | |||
| Jul 7, 2018 at 3:57 | |||||
| Jul 6, 2018 at 21:17 | history | asked | BenAndo | CC BY-SA 4.0 |