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I didn't see any noise in the scope. Just the usual.
Also, the trigger signal is DC. I'm not switching at any frequency. Just opening and closing from a XOR gate's output.
Hi all.
I've been doing some tests with a circuit based around a cd14538.
In the datasheet it says it can be triggered by either positive going edge or negative going edge.
In this situation I need it to be trigered by the second option (negative).
During breadboarding I noticed that the IC...
Hi all. Thanks very much for your input.
SunnySkyguy: no twisted pair needed. The flip-flop, mosfets, everything except the contactor is on the PCB.
KlausST, I´d like to use a smart switch too, but I was asked to use generic parts. The fact of being more discrete is intentional.
Regarding the...
Yes. It's a few meters away and it's hardwired.
Besides, I'm not allowed to change the wire configuration.
So no, I only have one terminal to control the relay. The other side is put to ground.
Martin.
Hi all.
I have a question. I have to switch a contactor/relay. It has to remain open for fifty secs every two minutes or so.
The coil resistance is 58 ohm and it takes 0.50 amps aprox (36Vdc) , and is connected to ground.
Some people suggested using relays, but I wanted to do it all solid state...
Thanks for your reply Frank.
So basically a voltage divider will do?
Maybe followed by a zener or a TVS diode?
I'm concerned since 36 Vdc will be going into this cmos gate and I was thinking of some sort of protection.
Martín
Hello all.
I have a question that someone might be able to help me with.
I'm designing a device whose input will be 36-0 Vdc (on and off).
That will go into a NAND gate (4093).
The thing is that the gate accepts 15 Vdc tops at its input.
Besides a simple voltage divider, can anyone think of...
FvM, first of all, I´d like to thank you for your time.
The AC sine wave at the output seems pretty much ok, although there's a small (very small) distortion approaching the the 0V crossing point.
I've been doing some measurements and tweaking the circuit a little with no results so far.
I've...
FvM, thanks very much for your reply.
The pictures I posted were just figurative of the type of distortion I'm getting at the gates of the IGBTs placed on the high side.
I don't have at home a power supply capable of reaching 40Vdc, and since the H bridge starts working at 15Vdc, i thought it...
Hello guys.
This is my first post here, though I've been going trough the forum for rather some time.
I´m designing an inverter based around a dsPIC33FJ128MC802 and two IR2110 in a full bridge configuration driving four IRGP4063D IGBTs.
The PWM signal is switching at 20khz and the DC Bus voltage...
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