BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
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Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
Granada Television Brochure, 1970s
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Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
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Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
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1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
Battery Eliminator.
I've wondered about the wisdom of posting this. Apologises to Mrs Ticktock if Chris makes a mess. Seriously, if anybody is daft enough to copy it that's their funeral - probably literally, you have been warned do not attempt this.
Any road, here is the beast in question:-
It appears to work but I haven't yet tested it on the radio. I'm dog sitting and it's best done when I can concentrate fully.
Cheers
Joe
Jeeez!!! now I like knocking up hardwired-frankenwooden-projects but that's frankenwooden-scarey!!!
Next you will be creating EHT ones.
seriously very interesting and I'm curious.
Chris
CrustyTV Television Shop: Take a virtual tour
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Here's the circuit:
I got the idea from a capacitor reformer circuit. I ran my version passed a very well qualified electronic designer who didn't actually faint, so I thought it was worth trying. Capacitor testing is another use for it.
When it's finished it will be neater than that and will also have a transformer/LM317 for the LT.
The construction method is one I saw a kid using to make crystal sets on 'Why Don't You?' back in the day.
- Joe
Nothing wrong with that construction
It was how all the radios in Ladybird Book Building a Transistor Radio were built.
I built one using original parts with my nephew a couple of years back it was brilliant.
The is a page about it here http://homepage.ntlworld.com/henry01/la ... _radio.htm
You can build surprisingly complex circuits as long as you have decent length wires.
Enjoy 😉
Mike T
I don't care if it was a bargain whats it doing on my kitchen table. www.cossor.co.uk
How much current are you intending the 82V supply to provide? The average 4 valve battery set needs 90V at around 10mA.
Al
My Bush BP90 should take 10mA but actually draws 12mA.
If I did my sums right (and there's always a first time) it'd give about 30mA through a dead short, or at least until something blew.
Since making that death-trap I haven't actually used it as I like the radio on batteries for portability's sake.
- Joe
Joe!
I have just had another look at you picture. Are you supplying the mains directly to this circuit? What are you planning the the circuit to be used for?
This type of circuit must never be posted on any kind of public forum!
Al
As I said, it isn't used AT ALL.
- Joe
if it was tidied up and built inside a radio it would be no different than any ac/dc set with a wooden or plastic case, i dont think jo would use it on say a vidor with a metal face plate
rob t
It's easy to get a small mains to 24 + 24 (two secondaries).
Put them in series and a voltage doubler.
resistor and 3rd cap to drop volts to between 75 and 105.
(135V no load)
I think the breadboard above should have a health warning!
This will be perfect. Use 3 x 100uF 150V (min) capacitors
Put 100K across C1 and C2
If radio is 6mA then R1 is twice as large!
R1 chosen for 12mA
R2 represents the Radio. Do not install it!
Download page for Duncan Amps PSU2 program used to verify and print the design. http://www.duncanamps.com/psud2/download.html
It won't design PSUs. But it help you adjust R1 and tell you what the ripple and output voltage is.
I know I can be a nutter at times, but there's no way on this earth I would build that thing at the top!!! I'll stick to battery inverters..
Regards,
Lloyd.
BTW, with a 12mA Radio the RMS current in R1 is about 30mA and RMS volts about 37V
So that is 1.1W
Use a 2.5W resistor. Or 2 x Series resistors at half value, or 2 x parallel at twice value and then 1W resistors are fine.
For a 9mA radio increase R1 to 2K2, but wattage is <900mW, so a 1.2W or 1.5W is OK
Likely 3 x 47 uF will work fine for a 10mA radio
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