|
Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
|
Thread Tools |
27th Oct 2014, 6:08 pm | #1 |
Retired Dormant Member
Join Date: Jul 2014
Location: Stoke On Trent, Staffordshire, UK.
Posts: 247
|
Making A Radio?
I had a brainwave today. Stored on my boat I have an action man walkie-talkie toy. It transmits and receives at short distances. In a fairly impulsive frame of mind, I removed one entire PCB from the case plus the speaker. With a battery wired in, it crackles quite happily. So, I'm thinking of changing the circuit a wee bit to make it into a radio. For that, I'll need a variable condenser and a better ferrite aerial. Then it would be interesting to see with some meddling if I can get it to pick up stations.
Just a thought for a rainy day. |
27th Oct 2014, 6:44 pm | #2 |
Guest
Posts: n/a
|
Re: Making A Radio?
A quick google leads me to think these are 49MHz items, a) not quite proper to use here in the UK and b) bloomin' hard to modify into a 'radio'. You might (a big might) get it to work a bit on VHF/FM. I may be wrong.
|
27th Oct 2014, 7:07 pm | #3 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
Re: Making A Radio?
The receiver may be a super-regen type for 49MHz AM reception. The only thing worth
saving is the speaker. You may be able to build this which stands a chance of working : http://www.rapidonline.com/design-te...-mk194-70-4037 |
27th Oct 2014, 11:28 pm | #4 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
|
Re: Making A Radio?
If it's got two transistors, I'd suggest simply using those plus a few other bits to make a reflex regen MW receiver. On strong signals you should get enough output to drive a small speaker.
Maybe something like this? http://www.electroschematics.com/601...adio-receiver/
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
28th Oct 2014, 12:20 pm | #5 |
Rest in Peace
Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
|
Re: Making A Radio?
Starting from scratch with the right components may be less frustrating than pressing into service the wrong components.
|
28th Oct 2014, 5:09 pm | #6 | |
Retired Dormant Member
Join Date: Jul 2014
Location: Stoke On Trent, Staffordshire, UK.
Posts: 247
|
Re: Making A Radio?
Quote:
|
|