I was browsing eBay- as u do on days off and spotted this- 2 bridge rectifiers- can’t tell if they are series or parallel - what is the purpose here?
Bridge rectifier
- Latteman
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Bridge rectifier
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Denon DP47f; AT-VM95SH
GL-59; ARB uni pivot; AT- Signet
Ifi Zen Phono
Doug Self balanced Pre amp
Akai 4000DS mk2 R2R
Digital Sources- Argon Pi4 v2; IfI iUSB 3.0, Ifi Neo idsd Dac;
Tidal / Radio Paradise
Amplification Nva 300va mono blocks
Speakers Lii Audio F-15 in Open Baffle; Ls6
Weiduka AC8.8- for digital sources
Mini BMU for analog sources
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- Latteman
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Re: Bridge rectifier
Analogue Source -
Denon DP47f; AT-VM95SH
GL-59; ARB uni pivot; AT- Signet
Ifi Zen Phono
Doug Self balanced Pre amp
Akai 4000DS mk2 R2R
Digital Sources- Argon Pi4 v2; IfI iUSB 3.0, Ifi Neo idsd Dac;
Tidal / Radio Paradise
Amplification Nva 300va mono blocks
Speakers Lii Audio F-15 in Open Baffle; Ls6
Weiduka AC8.8- for digital sources
Mini BMU for analog sources
Denon DP47f; AT-VM95SH
GL-59; ARB uni pivot; AT- Signet
Ifi Zen Phono
Doug Self balanced Pre amp
Akai 4000DS mk2 R2R
Digital Sources- Argon Pi4 v2; IfI iUSB 3.0, Ifi Neo idsd Dac;
Tidal / Radio Paradise
Amplification Nva 300va mono blocks
Speakers Lii Audio F-15 in Open Baffle; Ls6
Weiduka AC8.8- for digital sources
Mini BMU for analog sources
Re: Bridge rectifier
They look in parallel to me and as per by listing ( now ended ) boards were replaced by NVA at some point.
https://www.ebay.co.uk/itm/NVA-A60-Powe ... true&rt=nc
https://www.ebay.co.uk/itm/NVA-A60-Powe ... true&rt=nc
- karatestu
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Re: Bridge rectifier
Most power amplifiers have split rail power supplies. NVA amp boards need a split rail psu (positive & negative voltage)
That amp in the picture is a stereo amp. The transformer has two secondary windings which have two wires joined to give a centre tap.There are only two smoothing capacitors (the big ones in bottom right corner) - one supplying positive voltage for both amp boards and one supplying negative voltage to both amp boards.
The two rectifiers look to have their AC voltage inputs joined with short wires. The positive DC is taken from the rectifier closest to the transformer and the negative DC is taken from the one further away from the transformer.
That amp in the picture is a stereo amp. The transformer has two secondary windings which have two wires joined to give a centre tap.There are only two smoothing capacitors (the big ones in bottom right corner) - one supplying positive voltage for both amp boards and one supplying negative voltage to both amp boards.
The two rectifiers look to have their AC voltage inputs joined with short wires. The positive DC is taken from the rectifier closest to the transformer and the negative DC is taken from the one further away from the transformer.
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Re: Bridge rectifier
"The positive DC is taken from the rectifier closest to the transformer and the negative DC is taken from the one further away from the transformer."
Each bridge rectifier works as "half-bridge" - think about what it does to the output frequency
Each bridge rectifier works as "half-bridge" - think about what it does to the output frequency
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Re: Bridge rectifier
Nothing, it will still be 100Hz (in the UK at least).Each bridge rectifier works as "half-bridge" - think about what it does to the output frequency
Its probably wired like this:
- savvypaul
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Re: Bridge rectifier
Speaking with Tomasz, he's not seen that particular bridge rectifier arrangement on any of the NVA amps he worked on. Richard must have had his reasons, though...assuming it was his work.