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| Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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21st Jun 2021, 11:01 am
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#1 |
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Hexode
Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 336
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Star-masterkey (mk1)
Good morning all.
I have the above cw sounder which has a problem. Has anybody got the schematic for this one, the MK1 not the MK2. Any pointers would be appreciated. Thanks Snowy G0HZE |
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21st Jun 2021, 11:57 am
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#2 |
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Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,901
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Re: Star-masterkey (mk1)
I think Dewsbury Electronics were the main importer.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
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21st Jun 2021, 12:07 pm
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#3 |
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Hexode
Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 336
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Re: Star-masterkey (mk1)
Hi David
Yes they were, i still have the sticky label on the back, made a small amount of progress with it, wondered why the 40** series of i/cs had 9volts across them when they are 5volt , found out that the battery pack should be 4 x aa cells in a holder and not a 9v pp3. however i still get a continuous tone on switch on which is not controllable from the front socket when a key, either up/down or paddle type is pluged in. Snowy |
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21st Jun 2021, 12:22 pm
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#4 |
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Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,724
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Re: Star-masterkey (mk1)
CMOS 4xxx series logic should work on anything between 3 to 15 volts.
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-- Graham. G3ZVT |
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