Potential divider using capacitors/diodes ? - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Diabolical Artificer · 9th Mar 2014, 8:53 am

That's a clever little circuit and looks just the thing I need. I was worried about dumping all that power as heat, hence my OP. Could probably have phrased the question better.

Looking at the schematic then I'd need a 24V zener or could I use two 12V in series? As I have some 5A 12V zeners.

Andy.

dave cox · 10th Mar 2014, 1:03 pm

Andy, your on the right track but my guess is that the output from the bucket regulator will be too crude to use directly and you will need a linear regulator following it to iron out the bumps

For example, with bucket regulator set to 30V, then using a LM317 (operating with a 4V drop) is only 12W. I never actually got round to trying that bucket circuit as the only thyristor I had available is 1.2KV @ 200A and weighs about 1/2 kilo !

dc

Diabolical Artificer · 10th Mar 2014, 4:26 pm

I intend to use the bucket regulator as the primary regulator to drop the excess voltage before then regulating it further,as you say Dave with a LM317 etc.

Ordered the parts,will let you know how I get on. Andy.

9th Mar 2014, 8:53 am	#21
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,657	Re: Potential divider using capacitors/diodes ? That's a clever little circuit and looks just the thing I need. I was worried about dumping all that power as heat, hence my OP. Could probably have phrased the question better. Looking at the schematic then I'd need a 24V zener or could I use two 12V in series? As I have some 5A 12V zeners. Andy. __________________ Curiosity hasn't killed this cat...so far.

10th Mar 2014, 1:03 pm	#22
dave cox Nonode Join Date: Jan 2009 Location: Bristol, UK. Posts: 2,061	Re: Potential divider using capacitors/diodes ? Andy, your on the right track but my guess is that the output from the bucket regulator will be too crude to use directly and you will need a linear regulator following it to iron out the bumps For example, with bucket regulator set to 30V, then using a LM317 (operating with a 4V drop) is only 12W. I never actually got round to trying that bucket circuit as the only thyristor I had available is 1.2KV @ 200A and weighs about 1/2 kilo ! dc

10th Mar 2014, 4:26 pm	#23
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,657	Re: Potential divider using capacitors/diodes ? I intend to use the bucket regulator as the primary regulator to drop the excess voltage before then regulating it further,as you say Dave with a LM317 etc. Ordered the parts,will let you know how I get on. Andy. __________________ Curiosity hasn't killed this cat...so far.