Help with basic voltage reducing circuit for auto - Electronic Circuits Projects Diagrams Free

Terry335 · 21st May 2007, 04:06 AM

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Norlin · 21st May 2007, 01:13 PM

am no expert here, but I'm guessing you could use an undervoltage sensing IC such as the MC34164P-3 http://pdf1.alldatasheet.com/datashe...C34164P-3.html
Have the normal power go through a transistor, when the voltage hits 3V, have current flow through the MC34164P-3 to the circuit as well as the base of the transistor to turn it off (perhaps a PNP with an inverter between it and the MC34164P). Between the MC34164P-3 and the circuit, have something that will make the voltage climb slower. Just my probably not so great idea, hope it helps stir up some better ideas.

**3v0** · 21st May 2007, 02:24 PM

Do you need to consider throttle position, rpm, and maybe time ?

I do not know, if you do not you need to find out.

Hero999 · 21st May 2007, 03:01 PM

It could be done using a couple of op-amps and a voltage reference IC but it's a bit long-winded.

Use a subtractor to get 0-1.3V divide it by 1.083 using a potential divider, then add 1.9 using an adder.

Norlin · 21st May 2007, 08:55 PM

in this circuit, even though you're diverting away some of the current you're not changing the voltage at the point where the circuit splits.

21st May 2007, 04:06 AM	(permalink)
Terry335 New Member	Help with basic voltage reducing circuit for auto * Protected Info * Last edited by Terry335; 29th April 2008 at 12:37 AM.

21st May 2007, 02:24 PM	(permalink)
3v0 Moderator Blog Entries: 3	Do you need to consider throttle position, rpm, and maybe time ? I do not know, if you do not you need to find out. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, Homepage The 15 Minute Printed Circuit Board! (+drill time)

21st May 2007, 03:01 PM	(permalink)
Hero999 Experienced Member	It could be done using a couple of op-amps and a voltage reference IC but it's a bit long-winded. Use a subtractor to get 0-1.3V divide it by 1.083 using a potential divider, then add 1.9 using an adder. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

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21st May 2007, 01:13 PM	(permalink)
Norlin Experienced Member	am no expert here, but I'm guessing you could use an undervoltage sensing IC such as the MC34164P-3 http://pdf1.alldatasheet.com/datashe...C34164P-3.html Have the normal power go through a transistor, when the voltage hits 3V, have current flow through the MC34164P-3 to the circuit as well as the base of the transistor to turn it off (perhaps a PNP with an inverter between it and the MC34164P). Between the MC34164P-3 and the circuit, have something that will make the voltage climb slower. Just my probably not so great idea, hope it helps stir up some better ideas.

21st May 2007, 08:55 PM	(permalink)
Norlin Experienced Member	in this circuit, even though you're diverting away some of the current you're not changing the voltage at the point where the circuit splits.