EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: mcovington on June 25, 2020, 10:26:38 pm
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Does anybody out there have a circuit diagram of the Tacklife MDC01 (which is probably sold under other names)? Or a similar low-end lab power supply (switching)?
This is the one I have: https://tacklifetools.com/products/dc-power-supply-variable-switching-dc-regulated-power-supply-with-4-digital-lcd-display-reverse-polarity-high-temperature-protection-110v-115cm-alligator-leads-included
It works fine -- I'm not needing to repair it -- but I'm always interested in knowing how my equipment works.
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Looks very similar to a MCH K305D.
Schematics attached in this post:
https://www.eevblog.com/forum/testgear/cheap-variable-switching-power-supply/msg1240531/#msg1240531 (https://www.eevblog.com/forum/testgear/cheap-variable-switching-power-supply/msg1240531/#msg1240531)
Another thread about these:
https://www.eevblog.com/forum/testgear/mch-k305d-cheap-switching-lab-power-supply/ (https://www.eevblog.com/forum/testgear/mch-k305d-cheap-switching-lab-power-supply/)
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Thank you! I couldn't get a diagram from Tacklife -- they apparently don't build it, just label and sell it -- so I was hoping for diagrams of something similar (need not be identical). Very much appreciated!
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That is not exactly the one, but it's definitely close enough to tell me how the designers think. The one I actually have has 4-digit displays and has a fan controlled by a thermostat (off or on, almost always off). So if a closer match turns up, I'll welcome it. But I'm already off to a good start. Thanks again.
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No schematic diagram, but some additional info.
It's a hybrid design, with a switching pre-regulator followed by an linear final stage, very similar to the Peaktech 6225A, which was reviewed by "Electro Bob" https://www.electrobob.com/peaktech-6225a-review/ (https://www.electrobob.com/peaktech-6225a-review/)
One of his users posted a link to a reverse-engineered partial schematic of the control loop https://www.dropbox.com/s/wj405m435snhx5f/Peaktech%206225%20A.pdf?dl=0 (https://www.dropbox.com/s/wj405m435snhx5f/Peaktech%206225%20A.pdf?dl=0)
And it looks identical to the HyElec model HY3005B, which has some teardown photos on this forum (text in Chinese), https://www.mydigit.cn/forum.php?mod=viewthread&tid=79335 (https://www.mydigit.cn/forum.php?mod=viewthread&tid=79335)
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Sorry it took me so long to get back. That (the Peaktech) is it, and the information is very helpful. THANK YOU!