Created by
Created November 08, 2013
Last modified October 28, 2014
Tags car-charger   charger   ham   ham-radio   handheld   ht   icom   radio   t90a  


This is the dc voltage regulator circuit I built for charging and running my Icom T90a handheld radio from my car.


The Icom T90a runs on 5.5V - 11.5V. In order for the charger to work, you need to supply more than the battery provides which is 7.8V. So for a good DC charger, you will need 7.9V - 11.5V. This circuit is capable of providing that from a DC source of 10.8V up to 16V+ Which is within the spec of a car's battery and alternator.

The trimmer pot is used to fine tune the output voltage. You should tune the voltage here when its under load to get it perfect.


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