Making series Vreg to sink current

KasperM · 30th November 2001, 11:51 AM

I just signed up after visiting this forum daily for some time - great forum!

I've been reading the "Regulators for high performance audio" articles in Audio Amateur by Walt Jung (and others).

Since the proposed voltage regulators are series type regulators they can not sink current. However WJ mentions a modification to series type regulators enabling them to both source and sink currents (bleed current). How is this done?

Kasper

Nelson Pass · 30th November 2001, 06:30 PM

One way is to load the regulator with a given
amount of resistance and by regulating the
voltage across the resistor, the device will
draw a relatively constant current.

For example, with a three pin positive regulator,
one pin goes to ground (or perhaps a negative rail),
a resistor goes from the output of the regulator to
this same ground, and the positive input pin of the
regulator will try to draw approximately the voltage
rating of the regulator output divided by the
resistor value. There will also be a small current
which runs the regulator itself, but this will also
tend to be constant.

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
BUF420M Current Sink	audiowize	Tubes / Valves	2	13th September 2008 03:16 AM
Any clue of how to use this part as a current sink for a CF?	G	Tubes / Valves	36	19th July 2006 07:35 AM
Pentode current sink	ABJ	Tubes / Valves	14	23rd January 2005 09:56 PM
Using Ixys current regulator as current sink.	G	Solid State	3	16th November 2002 10:23 AM
Help with Current Sink	RichardJones	Pass Labs	1	31st January 2002 04:52 PM

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


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th November 2001, 11:51 AM	#1
KasperM diyAudio Member Join Date: Nov 2001 Location: Aalborg, Denmark	I just signed up after visiting this forum daily for some time - great forum! I've been reading the "Regulators for high performance audio" articles in Audio Amateur by Walt Jung (and others). Since the proposed voltage regulators are series type regulators they can not sink current. However WJ mentions a modification to series type regulators enabling them to both source and sink currents (bleed current). How is this done? Kasper

30th November 2001, 06:30 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	One way is to load the regulator with a given amount of resistance and by regulating the voltage across the resistor, the device will draw a relatively constant current. For example, with a three pin positive regulator, one pin goes to ground (or perhaps a negative rail), a resistor goes from the output of the regulator to this same ground, and the positive input pin of the regulator will try to draw approximately the voltage rating of the regulator output divided by the resistor value. There will also be a small current which runs the regulator itself, but this will also tend to be constant.

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