Oct. 17th, 2016

rinioth: (radio)
A few weeks ago I was reading one of the Vintage Wireless Forums that I look into occasionally and someone was talking about the "Heath Robinson" radio he had built from junk parts he had laying about in his workshop. The idea appealed to me and after a brief rummage through various boxes I came up with enough parts to build this:

Heath Robinson AM Rx

Even the base board is a piece of scrap peg board. The valve (tube for you USians) is a double triode of which I'm only using one half. The power transformer is about 10 times the size it needs to be - but it was in the junk box so I used it. The yellow socket in the middle of the coil is where the antenna plugs in and it quite happily pulls in a number of AM Medium wave radio stations. The basic circuit is a simple regenerative one with the minimum number of parts. From left to right the parts are: The power transformer, the rectifier and smoothing capacitor for the HT, the Headphone socket, the ECC81 valve, the main tuning capacitor, the coil with the (blue) regenerative winding over one half and finally the regenerative variable capacitor. There are a couple of small parts that are not visible in the photo.

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Colin

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