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I think that an application note written by ON Semiconductor might be helpful here. It is AN1568/D "Interfacing between LVDS and ECL". The web page is onsemi.com
Let me see if I understand the problem. We have a sensor that measures the current and turns this measurement into a voltage. You want to measure this output voltage and when a specified voltage is met you want a circuit to be enabled that will then decrease the current that is measured by this...
Sorry I didnt offer any zener ideas. So here are the best I can think of. Maybe techie had something else in mind?..
Zener ideas:
Vin = Voltage in
Z<| = Zener diode (lets call it a 4.7V)
C = Your Circuit
GND = Ground
Vin---------C-------Z<|---------GND
This setup would keep circuit C off...
The nice thing about using a zener is that it would make for a very simple circuit. There are a few reasons way this may be a bad idea. With a zener you will be using the reversed bias breakdown voltage for the control this is probably ok if the voltage that you need is available. (there are...
I just found this on the web. Again it probably is not exactly what you are looking for but hopefully will get you started.
**broken link removed**
R3, R4 and P1 set the level (Vref) that the comparator (U1) is going to switch on. Pin 2 of U1 is the input voltage that you are trying to...
I dont have a specific circuit for you but it sounds like you could build this circuit in two stages. In the first stage I would use an op amp as a comparitor. This would then enable the second stage which could simply be a transistor that youa re turning on and off.
best pull up resistor for uln2003 circuit
This may sound silly but what about a simple RC circuit on the enbale pin of a driver. Connect P1 to the driver 74hc245 (or such) and drive the relays from here. When the system is powered on the RC circuit will keep the driver disabled after the system...
4x4 switch matrix discussion
I dont have a circuit for you but I will discuss the problem.
You need a 4x4 switch matrix. right...
Vcc---|-------|-------|-------|------A0
| SW0 | SW1 | SW2 | SW3
Vcc---|-------|-------|-------|------A1
| SW4 | SW5 | SW6 | SW7...
more input
I have to agree with scatgat. The 7812, 7808 and the 7805 would be the simplest way to achieve what you are looking for. Since you are using this in a cct (closed circuit television??) setup up I would expect that the current requirements are not that large. I do know that the 7812...
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