[simpits-tech] Electronics question

[Cris Harrison]

ignorance is bliss,
first your rotary is not a pot. pots are resistors. the encoder generates
pulses.
If you have your hart in doing this and you want outputs that go from 0 -
5vdc, the
use 2 open collector gates, no diodes, no R-divider, no nothing.
you need a switch (two, one for each, forward, backwards, so when you close
this
you turn on a TTL gate with open collector outputs on (5v) this device
requires a 5vdc source for the output through a small value of R say 1k your
output is at the junction
of the resistor, and the gates output.  DONE
CH

On Fri, Mar 13, 2009 at 3:16 AM, Jeroen Huijben
<jeroen_huijben at hotmail.com>wrote:

>  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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