UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Other Discussions > Homebrew Equipment

Notices

Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members.

Closed Thread
 
Thread Tools
Old 9th Nov 2008, 5:43 pm   #1
HMV 1120
Hexode
 
HMV 1120's Avatar
 
Join Date: Jan 2007
Location: Weeting, Norfolk.
Posts: 465
Default Tinkering projects...

It has been some time since I last posted anything constructive on this forum. Partly that has been the fault of dads attempts at re-routing the phone line, but mostly because of all-consuming college.

Anyway, I thought I'd share what I'd been upto in the brief interlude after becoming M6GLD.

First up, the Kilmot DSB transmitter. this puts out appro 1.5 watts on 80 meters, tunable betwen 3.590 - 3.670. Atleast, it would if I hadn't fried a transister in the driver stage. Hopefully I'll get tht sorted before too long and I'll be running on 80...
http://i148.photobucket.com/albums/s...g/DSCF0570.jpg

This lump is a Topband VFO with approx 0.5W out, as well as a crystal tone generator - switchable for every 100 or 10KHZ. Very useful for tuning the R1.07. This is my project for the intermediate.
Inside it is very solidly built, almost entirely war surplus valves and caps with a 1930s ceramic coil wound on a ceramic base. Somebody put plenty of time into it! The case is from an American airborne set. I wonder if anybody recognises what set the dial was taken from? (My guess is that it too is american).
http://i148.photobucket.com/albums/s...g/DSCF0571.jpg

Finally, a little bit of fun I a simple radio using an EF91 as a diode, with 6V on the heater (or 5.4v here, withy a tired 9Volt battery)and either 18-27vdc on the plates. Crude tuning, but it offers scope to construct a proper LC circuit for MW or LW at a later date. It works as well as can be expected, with 6-7 stations during the day on my garden long line and a near inseperable mass at night.
http://i148.photobucket.com/albums/s...g/DSCF0568.jpg
http://i148.photobucket.com/albums/s...g/DSCF0569.jpg
__________________
Real radios glow in the dark
M6GLD
HMV 1120 is offline  
Old 9th Nov 2008, 8:57 pm   #2
dave walsh
Dekatron
 
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,814
Default Re: Tinkering projects...

Fascinating Rob. This is how Clive Sinclair started out, eventually writing writing textbooks and then er....I think he went into computers?
That tuning knob does look like an American casting and puts me in mind
of the BC348 wartime set but it's the wrong shape for that particular one.
I remember building a triode oscillator using 1930's parts [screw connections] when I was your age. I think I could only cobble 15v HT but to my amazement, it worked! Dave
dave walsh is offline  
Old 12th Nov 2008, 10:40 pm   #3
HMV 1120
Hexode
 
HMV 1120's Avatar
 
Join Date: Jan 2007
Location: Weeting, Norfolk.
Posts: 465
Default Re: Tinkering projects...

Having just finished playing with my latest 'toy' it is both amazing and very satisfying to have a bunch of wires and components to come to life with a tweak of a trimmer. Kinda like giving birth, only a lot less painful (then again, looking at various fingers that forgot where the iron was...)


Would love to here more about the triode osc.

73's,
Robs
__________________
Real radios glow in the dark
M6GLD
HMV 1120 is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 11:37 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.