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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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23rd Oct 2012, 9:36 am | #21 |
Hexode
Join Date: Apr 2003
Location: Cotswolds, UK.
Posts: 465
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Re: R1155 Power Supply
Yikes, that's a lot :-(
A thought, based on my own building of PSUs for 1155s. The LT for both the 1155 and 1154 is intended to be DC and as a result is not wired with all of the tricks to reduce hum that an AC set would have. As a result I have always built PSUs with a DC LT supply. just a thought Robin G5HI |
4th Dec 2018, 4:54 pm | #22 |
Octode
Join Date: Nov 2010
Location: Ross-on-Wye, Herefordshire, UK.
Posts: 1,652
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Re: R1155 Power Supply
Ray,
having built a R1155 psu not that long ago, I would recommend Radio_Dave's solution he posted in message #14. I like the choke input HT filter - it means you will get a pretty stable HT supply, which is always good to help the local oscillator stay on frequency! His solution is very similar to the one I designed. Certainly the 1946 article also posted, which has dual choke filter sections is these days inappropriate. It mirrors the original solution that the RAF used described in AP1186E, with their PSU Type 114, which used 2 x 10H chokes each followed by a 4uF capacitor. As someone else pointed out, they were limited in the values of capacitance they could achieve back then - so they went for extra inductance. Richard |
4th Dec 2018, 7:30 pm | #23 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Re: R1155 Power Supply
I've only just realised the circuit I attached in post #14 has a mistake. The "audio in" should be connected to pin 6 of the socket and not pin 5. I've attached a corrected circuit below
Regards David
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