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Are these related somehow? As soon as the peltiers are disconnected the voltage jumps to 12V and the rest of the unit powers up fans, LCD, etc Is this a common problem with a SMPS?

Oct 18, Electrolytic caps are BY FAR the 1 component failure in cheap switcher power supplies because they have high peak currents rushing in and out at high frequency. Once the power supply is up and running, I can plug the coolers back in and the unit cools perfectly.

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I checked both input capacitors ESR and found them to be at the datasheet max limit. Could this be causing the problem? Solar Powered Security Light In this teardown, we will look at the internals of a motion-activated light which contains its own solar charging system. I replaced the fan and reassembled the unit to see if it would power back up. Oct 18, 8. As soon as I get the lager caps in I’ll change them all just in case. Same result with another 1uF cap in paralell.

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I disconnected the peltier coolers and everything comes to life. The relays are energized to remove power from the peltiers as necessary for proper cooling. Oct 21, I keep seeing alot if info regarding ripple current, but not ESR.

It shows about 1. The fans are wired to run all the time.

2SC datasheet, Pinout ,application circuits Silicon NPN Power Transistors

You can force the ic to kick up by dataeheet pin 4 to pin 7 ground but as dayasheet not getting the 12 supply to start withi would say there is an heavy load pulling the slave osc down.

Can anyone tell me what type of SMPS this is? Radar Gun If you’re a speeder or sports player you may have experience with one of these! The TL usally has a slave start up oscillator oscthat produces its voltage, then the the ic takes over and feeds the start up osc with sync pulses to produce the desired regulated voltage,so your circuit will be similar to this design ,without the op amp chip.

Dec 4, Oct datasheett, 3. Does this make sense to anyone? Switch Mode Power Supply Posted by zulkifli in forum: Dodgydave – Yes, it is a 12V output supply.

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Oct 17, 1. The ESR of the big caps is climbing with every troubleshooting attempt. AS to the cooking switch transistor: I do have a low budget scope, so I checked out pin 4.

I also noticed that, once up datashest running, one of the heat sinked power transistors and its associated V uF input cap is getting very hot.

It’s also where manufacturers datahseet pennies and buy cheap. Also, I can’t seem to find the datasheet for these caps anymore. Anything else I should look at? In this Teardown Tuesday, we are going to take a look at the inner workings of a radar gun! Oct 18, 9.

The peltiers are connected to the relays you mentioned via the NC contact. Quote of the day. It could be that the soft start circuit is not ok.

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BTW, does the uF still gets hot, when everything is ok when you connect the peltier loads after sometime? Once I disconnect them the power supply comes to life. Dec 26, 7 0.