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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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22nd Sep 2018, 1:05 pm | #21 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: Power supply voltage doublers
Less than convinced that this is cost saving on the HG88 as it was not standard practice. It ends up using 3 separate capacitors and a resistor (including the RC smoothing) compared to a dual-electrolytic and a resistor for the traditional design. There is financial benefit in getting rid of the centre tap but a bridge rectifier is typically used for that.
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22nd Sep 2018, 2:30 pm | #22 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
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Re: Power supply voltage doublers
But a bridge is a pain needing two extra isolated diodes- more expense in a valve realisation.
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
22nd Sep 2018, 3:05 pm | #23 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: Power supply voltage doublers
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22nd Sep 2018, 3:37 pm | #24 |
Dekatron
Join Date: Oct 2003
Location: Southport Lancashire, UK.
Posts: 3,236
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Re: Power supply voltage doublers
Having just done a bit of research on the Fisher 400 and seen the price asked for them I had better dig it out of the loft and get those capacitors changed!
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Paul |
24th Sep 2018, 8:37 pm | #25 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,400
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Re: Power supply voltage doublers
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24th Sep 2018, 9:32 pm | #26 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
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Re: Power supply voltage doublers
But not a commercially driven enterprise with bean counters breathing down the designers' necks.
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |