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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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15th Nov 2020, 6:20 pm | #1 |
Pentode
Join Date: Dec 2019
Location: Egersund, Norway
Posts: 208
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FT290R problems
Hello, can any please tell me where due I find Q05, an ICL7660 voltage converter from +6,8v to -6,8v. Output on the -6,8V is only -1,7V. I can not find any "Reg Unit PB-2239".(Perhaps my eyes need update!)
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15th Nov 2020, 6:27 pm | #2 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,875
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Re: FT290R problems
Hi not sure what your after is at a source of the ICL7660?
If so there seem to be many suppliers including https://www.cricklewoodelectronics.c...waApNHEALw_wcB Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
15th Nov 2020, 9:32 pm | #3 |
Pentode
Join Date: Dec 2019
Location: Egersund, Norway
Posts: 208
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Re: FT290R problems
Thanks Mike, my problem was where to locate the item on the unit, but I finally now found it and had it checked. All is ok! The vu meter went to full deflectionas soon as the unit was switched, but I had that fixed!
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15th Nov 2020, 10:16 pm | #4 |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,575
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Re: FT290R problems
For future reference I believe the 7660 negative-from-positive voltage generator IC is made by several manufacturers each with their own prefix, so as well as the ICL7660 there is also the LMC7660 and MAX7660, for example.
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