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Vintage threads from the first ten years

Re: MOSFET bilateral switch?

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6/29/2000 4:25 PM
Tracy	Re: MOSFET bilateral switch? Hi In The ultimate tone I was reading about a mosfet bilateral switch that uses two mosfets with d @ s connected together and control gates tied together. would this work for me as a power supply resistor bypass switch. And could or would it be ramped up during swithing. Tracy

6/29/2000 5:58 PM
R.G.	Even beyond that, and probably simpler for most people, there are solid state relays that use two source-to-source MOSFETs and a special drive circuit that is all DC isolated from the input. This blocks both directions and is simple to drive.

7/2/2000 5:48 AM
Tracy	Re: Solid State Relays Hi R.G. I'm starting to find some solid state relays that look promising. the device i've specked is NEC ps7142l-1a , 6 pin dip 400 v, 200ma , optocoupler and mosfet switch. Thanks for the help Tracy

7/2/2000 6:06 AM
Tracy	Re: What about NTC's or MOV's in heater lines Im trying to think of a way to slow heater surge. I like the theory of the NTC Thermistor but will those things really last . I like simple but want reliable . I guess I could use a fuse in one line as well?

7/2/2000 10:43 AM
Stephen Conner	Re: Solid State Relays Hey tracy The solid-state switch might need to handle more current. There will be a big surge when you turn it on and the main filter cap suddenly charges up. Voltage rating should be OK, but check out whether that 400V rating is RMS AC, or DC. Steve C.

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