Circuit of low-end switching lab power supply (Tacklife MDC01)

[mcovington]

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.

[tautech]

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

Another thread about these:
https://www.eevblog.com/forum/testgear/mch-k305d-cheap-switching-lab-power-supply/

[mcovington]

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!

[mcovington]

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.

[SunnyDay]

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/

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

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

[mcovington]

Sorry it took me so long to get back.  That (the Peaktech) is it, and the information is very helpful.  THANK YOU!