Rectifier board?

littlerick · 16th January 2010, 12:33 AM

Could someone tell me if the rectifier board that I got with my LM4780 kit is any good for anything else...

I havnt killed the 4780.. Yet! I just wondered if the same board could be used with any transformer to use on different set-ups, or if each amp needs a different type of arrangement.

Peter Daniel · 16th January 2010, 02:17 AM

It's good for any other applications where you need rectifier bridges.

Here's an example when I used it in a prototype of my phonostage, which later ended up as this: The Phono Stage

littlerick · 16th January 2010, 09:17 AM

Am i right in presuming the purpose of it is to convert a AC signal from transformer to a DC one for amp to use?

If so will it work with any AC transformer?

Peter Daniel · 18th January 2010, 05:36 PM

Yes, you are correct.

tfrei · 26th April 2010, 11:38 PM

I put this question here since it deals with the power supply.

I'm putting together my second amp from audiosector. I'm using 24v (secondaries) torroid. My question concerns how to calculate the right resistor for the LED. Let's say I have a 40mA LED with 3Vf (voltage forward). First, I multiply the 24v value of the torroid by 1.4 (=33.6) since this is the actual voltage at the rails. Then I use the formula: (V-Vf)/If=resistor value. In this case: 30.6/.040=740. In addition, one might make an adjustment to have the LED operate at 30mA (not as bright) and redo the calculation. Is this the right way to calculate the LED value in a chip amp environment (specifically your 3887 kit)? Thanks for your help.

Peter Daniel · 27th April 2010, 01:41 AM

Here's an LED calculator: LED calculator for single LEDs

16th January 2010, 12:33 AM	#1
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	Rectifier board? Could someone tell me if the rectifier board that I got with my LM4780 kit is any good for anything else... I havnt killed the 4780.. Yet! I just wondered if the same board could be used with any transformer to use on different set-ups, or if each amp needs a different type of arrangement.

18th January 2010, 05:36 PM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Yes, you are correct. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

27th April 2010, 01:41 AM	#6
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Here's an LED calculator: LED calculator for single LEDs __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
converting tube rectifier to solid state rectifier.	tubo	Tubes / Valves	26	24th December 2009 12:12 AM
NP capacitors in the rectifier board?	lanchile07	Chip Amps	2	20th October 2007 06:10 PM
Help with removing and replacing rectifier (IRF 6125) from a heatsink board	hardhit99	Solid State	14	9th February 2006 08:06 PM
Anybody heard about Tarzian Silicon Rectifier for Tube Rectifier Replacement?	zxx123	Tubes / Valves	4	21st February 2005 04:02 AM
rectifier board not working after putting on bypass caps.	demogorgon	Chip Amps	19	8th December 2004 10:31 AM

16th January 2010, 09:17 AM	#3
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	Am i right in presuming the purpose of it is to convert a AC signal from transformer to a DC one for amp to use? If so will it work with any AC transformer?

26th April 2010, 11:38 PM	#5
tfrei diyAudio Member Join Date: Oct 2007	I put this question here since it deals with the power supply. I'm putting together my second amp from audiosector. I'm using 24v (secondaries) torroid. My question concerns how to calculate the right resistor for the LED. Let's say I have a 40mA LED with 3Vf (voltage forward). First, I multiply the 24v value of the torroid by 1.4 (=33.6) since this is the actual voltage at the rails. Then I use the formula: (V-Vf)/If=resistor value. In this case: 30.6/.040=740. In addition, one might make an adjustment to have the LED operate at 30mA (not as bright) and redo the calculation. Is this the right way to calculate the LED value in a chip amp environment (specifically your 3887 kit)? Thanks for your help.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read