This probably is a rudimentary question. I would like to have a simple analog (switch) circuit for addition modular 2, or \$a_1+a_2+\cdots +a_n \$ (mod 2). Certainly, digital transistors can accomplish this, but I would prefer analog devices if the circuit is simpler. In practical terms, I would like to design a switch circuit to control a light, where fixing all other switches, any one of them can switch the light on and off. For \$n=2\$ or 2 switches, someone earlier has already suggested using two back to back single-pole-double-throw switches.
Electronic – the simplest analog circuit for integer addition modular 2
analogswitches
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I think you have good idea, however it already exists in some variations. I found one example for BJT cascode stage: http://www.daycounter.com/Calculators/Cascode/BJT-Cascode-Calculator.phtml
But also, I'm encouraging you to make it on your own way for few elementary different topologies, having in mind this few points: 1. it should be online; 2. it should be in pure javascript (not Java or Flash) 3. dialogs should be in schematic 4. SVG for that matter should be the markup language of choice
That's only my opinion. Good luck with this nice idea.
I think you should consider using an analogue component known as a comparator. It would compare the signal from your thermistor with a set-point set by a potentiometer and tthen output high or low depending on which is higher.
Wiki is quite useful on this and worth a read. You can also make a comparator from an op-amp and realistically this will work just as well for your application.
Vin is compared against Vth. Vth is set by R1 and R2 with a slight influence from R3. In your application, R1 and R2 would be a potentiometer, maybe 10k and R3 would be typically 1Mohm. R3 provides hysterisis that guarantees a certain level of protection against the comparator output "chattering" when Vin nearly equals Vth.
Rload in the circuit can be your relay coil.
Best Answer
For 4 places see below: -
simulate this circuit – Schematic created using CircuitLab
For 3 places remove one of the two pole switches. For more than 4 just keep repeating the 2 pole switches.