[micscape]

A simple, low cost, conversion of incandescent-lamp illuminator to a power LED

My LOMO Biolam 70 has come with the OI-32 illuminator using a 220V AC 15W incandescent-lamp, which, when used for longer period gets very hot to the touch. This situation had me thinking of replacing incandescent-lamp with a power LED.

My experimenting with power LEDs resulted in permanent conversion of the OI-32 illuminator.

To drive the power LED I have used a low cost 10 W DC-DC Step Down Converter, KIS-3R33S module, capable of delivering up to 3A continuously. This module comes with output voltage preset to 3.3V.
However, it is easy to readjust and have output set at any voltage from 1.21 V – 10.43 V, if the circuit is modified then the output voltage can be varied up to 20V.