LCBPS/LCDPS max current questions Options  Watch this topic  Print this topic  Atom Feed  RSS Feed View » Normal Threaded

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findbuddha		#1 Posted : Wednesday, December 29, 2010 8:12:02 AM(UTC)
Rank: Member Groups: Member Joined: 8/26/2008(UTC) Posts: 11		In this thread (http://www.twistedpearaudio.com/forum/default.aspx?g=posts&t=304&p=1) I read that max current is ~500mA limited by resistors in CRC, and ~1.5A limited by voltage regulators. 1 What does CRC stand for? 2 What max current are the kit heatsinks suitable for? 3 How much current does the Opus kit use? 4 How to choose voltage of transformer for desired DC voltage? Thanks :) Edited by user Wednesday, December 29, 2010 8:23:50 AM(UTC)  | Reason: Not specified
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Russ White		#2 Posted : Wednesday, December 29, 2010 8:27:59 AM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		1 Capacitor - Resistor - Capacitor it is a technique used to reduce input noise. 2 That depends on the voltage drop of the application. Do you have on in mind? 3 Not much < 100ma but you may have other modules to power as well. 3 for 5-6V output we suggest the 9V trafos, for 12-15V output the 15V trafos. You want at least 3-4V of drop after the rectifier.
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findbuddha		#3 Posted : Friday, December 31, 2010 5:57:56 AM(UTC)
Rank: Member Groups: Member Joined: 8/26/2008(UTC) Posts: 11		I'd be looking at: ~450mA @ 12V for a miniDSP stack (+ maybe some more for an Arduino), 7.5V for somewhere between 1 and 4 x Opus. What's the max DC input for the Opus board? 12V ok? I might be able to use a single, more substantial 12V SMPS, but I'm not sure whether that would be too noisy. Eg. Meanwell S-15-12: "Ripple and Noise (max): 50mVp-p" Thanks :)
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glt		#4 Posted : Friday, December 31, 2010 10:24:27 AM(UTC)
Rank: Member Groups: Member Joined: 11/9/2007(UTC) Posts: 453 Location: usa		You are better off having a separate lcdps for the opus (one side for the analog and one side for the digital) and another for the electronics. The R in the CLRC filter can be lowered from the 10 ohm for more current/voltage capability
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findbuddha		#5 Posted : Friday, December 31, 2010 10:13:21 PM(UTC)
Rank: Member Groups: Member Joined: 8/26/2008(UTC) Posts: 11		Thanks, I assumed that would be the case, but it doesn't hurt to enquire about cheaper options! So 9V trafo would be best for 7.5V for Opus. Does the Opus pop its outputs at turn on/off? I might need to power some relays as well. :)
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Brian Donegan		#6 Posted : Saturday, January 1, 2011 6:05:21 AM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		findbuddha wrote: Does the Opus pop its outputs at turn on/off? I might need to power some relays as well. Nope.
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findbuddha		#7 Posted : Sunday, January 2, 2011 6:15:19 AM(UTC)
Rank: Member Groups: Member Joined: 8/26/2008(UTC) Posts: 11		Great! Just ordered 3xOpus 1xLCDPS :)
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Shaman		#8 Posted : Sunday, February 27, 2011 4:17:09 AM(UTC)
Rank: Advanced Member Groups: Member Joined: 1/11/2009(UTC) Posts: 70 Location: Greece		On a similar subject (and since the OP questions have been covered), can the LCBPS supply 350mA-400mA of current? What changes would I have to make? It'll be fed from an 18V AC transformer and set at +-15V DC. Also could an LCBPS be fed from a single transformer secondary going to both AC1 and AC2 inputs?
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avr300		#9 Posted : Sunday, February 27, 2011 5:42:16 AM(UTC)
Rank: Member Groups: Member Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times Was thanked: 70 time(s) in 69 post(s)		Shaman wrote: On a similar subject (and since the OP questions have been covered), can the LCBPS supply 350mA-400mA of current? What changes would I have to make? It'll be fed from an 18V AC transformer and set at +-15V DC. It depends. If it's an old LCBPS, you will have to short the 4 resistors R1-R4. If its a new one, 400mA should be ok. Shaman wrote: Also could an LCBPS be fed from a single transformer secondary going to both AC1 and AC2 inputs? Nope. You need a dual secondary.
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Shaman		#10 Posted : Sunday, February 27, 2011 3:30:12 PM(UTC)
Rank: Advanced Member Groups: Member Joined: 1/11/2009(UTC) Posts: 70 Location: Greece		Thanks avr!
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QED		#11 Posted : Saturday, April 14, 2012 4:58:11 AM(UTC)
Rank: Member Groups: Member Joined: 4/14/2012(UTC) Posts: 1 Location: UK		avr300 wrote: It depends. If it's an old LCBPS, you will have to short the 4 resistors R1-R4. If its a new one, 400mA should be ok. What's the max current the new LCBPS/LCDPS can supply? Do the resistors need to be shorted completely or can their value be reduced? Thanks.
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