[simpits-tech] Electronics question

[Jeroen Huijben]

It has to mimick a pot.

What I want is to turn the G25 shifter into three rotaries and this shifter is read by two pots.

The rotaries are processed by two flipflops each which should pull only one output high.

http://www.interq.or.jp/japan/se-inoue/e_ckt10_3.htm

That signal is then sent to the right transistors through diodes to prevent crosstalk.

 



 Date: Thu, 12 Mar 2009 19:26:14 -0500
From: phoenixcomm at gmail.com
To: simpits-tech at simpits.org
Subject: Re: [simpits-tech] Electronics question

jeroen,
This is the Hardway
seems like you overherd of Open Collector, outputs
1. put 5vdc on the collector through a small resistor like 330ohms,
put your lamp/what ever between the resistor and the open collector now you can pull this down with a gate if you want to, tada
Cris Harrison


From: crease-guard at sbcglobal.net
To: simpits-tech at simpits.org
Date: Thu, 12 Mar 2009 13:14:35 -0500
Subject: Re: [simpits-tech] Electronics question









So the A and B are used to open the base of the transistor to pull “X” to 5v or ground, correct?  Will your circuit work with “X” at 2.5 volts…i.e. neither high nor low?  How is “X” being measured/monitored?
 
Also, make sure both transistors don’t open at the same time.

Jay
 

Show me a man who cannot be bothered to do the little things, and I will show you a man who cannot be trusted to do the big ones.
--Lawrence Bell, Founder Bell Helicopter




From: simpits-tech-bounces at simpits.org [mailto:simpits-tech-bounces at simpits.org] On Behalf Of Jeroen Huijben
Sent: Thursday, March 12, 2009 10:13 AM
To: Simpits List
Subject: [simpits-tech] Electronics question
 
I am wondering if this will work.
 
I have a voltage divider of two resistors, set to put 2.5V at the output X when 5V is set over it.
I want to use a logic chip (74HC74 dual Dtype flipflop) to pull the output to 0V or 5V, depending on how a rotary encoder turns.
I have found how to turn the signal of the rotry into a high on either of two outputs of the flipflop.
Now I want to use two transistors to short out either of the resistors so that the output X is connected to either side of the divider.
 
http://i40.tinypic.com/jajuag.gif
A and B will go straight to the chip with only a diode in between.
 
Will this work?
Can I use any regular transistor?

Regards,
Jeroen.



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