electric fence , force field B20, 2007

The fuse is surface mount , I suppose as high current draw, if only intermittant ,it has to be quite high current, perhaps 10 amp from the 100 marking. Top face 8x5mm bent down the 3 mm over the other plate to one pad and the other smaller plate , about 6x45mm to the other pad and some thin material in between

The fuse is surface mount , I suppose as high current draw, if only intermittant ,it has to be quite high current, perhaps 10 amp from the 100 marking. Top face 8x5mm bent down the 3 mm over the other plate to one pad and the other smaller plate , about 6x45mm to the other pad and some thin material in between of this form, polyswitch

The main 14 pin SMD has no trace to 12V but p1 goes to this 8 pin SMD which is connected to 12V so presumably some sort of current or voltage control requiring 0 and 12V and the pot connection changes the current/V, not the speed from "Normal" setting to "Turbo" at the top of pot range, and the output somehow chopped or something from the 12V , smoothed by the 10uF.

Those polyswitch resetable fuses may have problems in hot conditions. Breathing on this one for 5 sec raises the 0.18R to double or so and a soldering iron barrel switched off and cooled for 2 minutes, laid on it, is enough to raise to kohm. Alternatively useful highly non linear thermal sensing elements.

So far have not found a buck boost L-free version of DC to DC converter , step down, IC, presumably made variable via use of the pot rather than a zener. L free version of Maxim MAX758,830,724 or 726 if anyone knows of something that fits the bill? This fence is stated to run on 9V as well as 12V battery so I suppose i/p 5 to 15V and output perhaps 6 to 13V or so