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Old 26th Nov 2022, 9:54 pm   #10
Philips210
Nonode
 
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,562
Default Re: Roberts R800 switch.

Hello Paul,

It's a neat little circuit that works very well and has been totally reliable.

With my dad's timer unit, I didn't make any alterations to his R701 radio. The timer circuit together with a PP9 battery was built in a diecast box which was external to the radio. The timed supply from the box simply feeding the radio's dc power jack. On the box were mounted two momentary push to make switches for starting and stopping the timed supply. I made a slight change to the circuit so it gave around thirty minutes before switching off.

The timer circuit could no doubt be built into the radio but mounting the switches without spoiling the originality of the radio could be a challenge.
I suppose the circuit could be easily adapted to give simple on/off operation without timed operation or have both as an option.

Regards,
Symon
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