SR Super Charger / Cycler (SCC)

I love my SCC but it was designed in 1993 back when NiMH cells did not exist in the consumer markets. Still, I love how simple it is and use it constantly for slow-charging, etc (it has all the functions of a WhattMeter built into it).

For fast charging it requires a hefty external power supply or a large battery, but for slow-charging I'd been using it with a "wall-wart" and I finally decided that it would be even more convenient to have a supply built into the case and so I could use a regular IEC power cord.

• The SCC with an external wall wart power supply that puts out 2A / 12 VDC.
• Break open the case and throw these bits away.
• This is what's left over. You'll need to buy a power inlet socket shown at the bottom of the picture (and a couple of screws, some wire, and other small bits).

• I covered the side of the case with white paper tape and drew the location of the holes I needed to make. You have to be a little careful because the case is made from Bakelite which is more fragile than most plastics. The walls are thick enough that you don't have to worry about breaking it, but if you're not careful it's easy to chip the edges of the hole so they end up looking ugly.
• I covered the power supply with a couple of layers of really heavy heat shrink and hot-glued it in place. There are any number of ways to fix the power supply in place, but if you use hot-glue do NOT cover the supply with CS since it's too thin and the extreme heat will probably melt it. I attached the DC leads to the charger board by soldering the ends directly to the backs of the DC input jacks. Having only a soldered connection means that if I want to pull the charger circuit board out I'll have to unglue the supply and unscrew the socket but since there's no reason for me to ever want to do this (knock wood) (:-) this was not much of a concern.
• All finished! Oh yeah, I also added a nice folding handle and a large patch of Velcro to the top of the case.

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Conclusions / Cautions

So far no problems and it all works great. However if you use a switching power supply like I did keep in mind that some of them may be very noisy (electrically) which may cause your charger to act weird. If you have a problem with this add a ferrite bead on the P.S. leads to the SCC and / or makes some kind of shielded enclosure for the supply.