Dome electrics - Step down power supply

Step down voltage reducer came in post yesterday.
Hooked it up to 7.2v power pack and digital volt meter and adjusted it down to 3.5volts.
It does say it's range is 3-40v, but it only showed min of 3.5v before the digital readout would go blank. Still 3.5v is still OK for running the smoke pump.


Next, was to test it on the pump unit. But after an slight incident(??) with the battery contacts, the unit's light failed to re-light and no power at end terminals. At £2.69 it's not the end of the world and have ordered some more. Still a bit disappointed with myself though.

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