high frequency relays - Page 4

akis · 10:25 PM

I have tried 8 or more relays, 5 are OK-ish, 3 did not work. One was probably defective (stayed always on even with DC load - PVD1354N), another had very big leakage in the off state (ASSR-5211). All measurements at 200 KHz. I am slightly worried that these things are not very reliable...

So the (very experimental) breadboard device so far is : +/- 6V DC power, oscillator (200 KHz, 4V peak), push-pull output stage, 1:12 transformer to raise the voltage to 50V peak, load of 1K at worst, 2K at best.

Next item will be the switching of the transformer's output to channels 1-2, or 1-2-3, or 1-2-3-4.

Final item will be monitoring: overloading (current limiting), correct frequency, battery low.

Forgot to say:

I am planning to have some sort of CMOS logic that will switch those relays on and off - that is why I looked at 5V relays only.

The signal source is the output of a transformer, it is floating, and those opto-isolated relays are ideal. If I used a FET for switching there would need to be some relationship between Gate and Source/Drain - but I'd rather the output of the transformer be completely unknown to the rest of the device. I think

jackinnj · 4th May 2012, 11:36 PM

Teledyne has mechanical relays used on a mission to circle the former planet "Pluto"! My Teledyne 712's will do "only" 10 million cycles.

4th May 2012, 10:16 PM	#31
akis diyAudio Member Join Date: Jul 2008	I have tried 8 or more relays, 5 are OK-ish, 3 did not work. One was probably defective (stayed always on even with DC load - PVD1354N), another had very big leakage in the off state (ASSR-5211). All measurements at 200 KHz. I am slightly worried that these things are not very reliable... So the (very experimental) breadboard device so far is : +/- 6V DC power, oscillator (200 KHz, 4V peak), push-pull output stage, 1:12 transformer to raise the voltage to 50V peak, load of 1K at worst, 2K at best. Next item will be the switching of the transformer's output to channels 1-2, or 1-2-3, or 1-2-3-4. Final item will be monitoring: overloading (current limiting), correct frequency, battery low. Forgot to say: I am planning to have some sort of CMOS logic that will switch those relays on and off - that is why I looked at 5V relays only. The signal source is the output of a transformer, it is floating, and those opto-isolated relays are ideal. If I used a FET for switching there would need to be some relationship between Gate and Source/Drain - but I'd rather the output of the transformer be completely unknown to the rest of the device. I think Last edited by akis; 4th May 2012 at 10:25 PM.

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4th May 2012, 11:36 PM	#32
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Teledyne has mechanical relays used on a mission to circle the former planet "Pluto"! My Teledyne 712's will do "only" 10 million cycles.