Any thoughts? replacing a potentiometer. - Electronic Circuits Projects Diagrams Free

quinjet · 24th August 2002, 02:10 PM

Hi,
I am trying to replace a joystick pot with something that could be activated
using a reed switch. I am thinking along the lines of the switch open/closed
(number over time) = pot movement. So I suppose a counter (ic 555?)going to a digital pot but I am too inexperienced (dim) to work it out. Any
help, ideas link etc gratefully rece :? ived.

eiad2002 · 9th September 2002, 10:36 AM

How about using the MOSFET transistor :shock: as a switch? :roll: You would be able to accomplish what you need.....

Good Luck

**mechie** · 9th September 2002, 06:54 PM

What is across the pot? is it a DC voltage, audio, etc.? Is it floating or refrenced to ground? Is it working as a potentiometer or just a variable resistor? Is it tiny current or lots of Watts?
Is the reed switch significant - voltage isolation or something?
What is the new control source - a pot to set the 555 frequency (full circle)?
How complex can the answer get before it's useless - could an opto coupler serve instead of the reed switch?

quinjet · 11th September 2002, 08:19 AM

8)
mechie,
The exact numbers you ask about I do not have to hand as I write but I can get them.
In essence I am trying to replace the forward reverse pot in a joystick 100k (5v) with a forward reverse motion of a wheel. This is why I thought of a reed switch and magnets and a circuit I saw using a 555 and 740 chips. Sadly it was not that simple, especially with my infants understanding of electronics. If this is still not clear just drop me a line.
Kevin.

quinjet · 11th September 2002, 08:22 AM

:?
eiad2002,
A MOSFET transistor? I will look this up and probably come back to you with a lot of ???????.
Ta,
Kev.

24th August 2002, 02:10 PM	(permalink)
quinjet New Member	Any thoughts? replacing a potentiometer. Hi, I am trying to replace a joystick pot with something that could be activated using a reed switch. I am thinking along the lines of the switch open/closed (number over time) = pot movement. So I suppose a counter (ic 555?)going to a digital pot but I am too inexperienced (dim) to work it out. Any help, ideas link etc gratefully rece :? ived.

9th September 2002, 10:36 AM	(permalink)
eiad2002 New Member	How about using the MOSFET transistor :shock: as a switch? :roll: You would be able to accomplish what you need..... Good Luck __________________ Analyze

9th September 2002, 06:54 PM	(permalink)
mechie Super Moderator	More info wanted What is across the pot? is it a DC voltage, audio, etc.? Is it floating or refrenced to ground? Is it working as a potentiometer or just a variable resistor? Is it tiny current or lots of Watts? Is the reed switch significant - voltage isolation or something? What is the new control source - a pot to set the 555 frequency (full circle)? How complex can the answer get before it's useless - could an opto coupler serve instead of the reed switch? __________________ I need a memory upgrade ... My head is full !

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
pins explain? motorized potentiometer..?	Ctrl_Alt_Del	General Electronics Chat	1	6th July 2005 11:05 AM
problem replacing switch with potentiometer	jeramiez	General Electronics Chat	4	13th January 2005 10:58 AM
Problems with Digital Potentiometer	MrWho252	General Electronics Chat	12	23rd April 2004 03:42 AM
How do I generate a potentiometer output?	klick	General Electronics Chat	3	23rd November 2003 02:26 PM
What value potentiometer for headphone volume control?	tom0826	Electronic Projects Design/Ideas/Reviews	4	31st August 2003 06:09 PM

11th September 2002, 08:19 AM	(permalink)
quinjet New Member	8) mechie, The exact numbers you ask about I do not have to hand as I write but I can get them. In essence I am trying to replace the forward reverse pot in a joystick 100k (5v) with a forward reverse motion of a wheel. This is why I thought of a reed switch and magnets and a circuit I saw using a 555 and 740 chips. Sadly it was not that simple, especially with my infants understanding of electronics. If this is still not clear just drop me a line. Kevin.

11th September 2002, 08:22 AM	(permalink)
quinjet New Member	:? eiad2002, A MOSFET transistor? I will look this up and probably come back to you with a lot of ???????. Ta, Kev.