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Title: EL7144C second source Post by: W4AMV on March 26, 2018, 01:55:14 PM The EL7144C was used as a MOSFET driver in Class D PA's. It is a Schmidt trigger limiter. I am looking for a supplier or a current second source equivalent. Thanks for any information. 73' Alan
Title: Re: EL7144C second source Post by: M0VRF on May 01, 2018, 09:36:54 AM Does it have to have the same pinout?
If 'NO' then use the now 'famous'? NCP81074. J. Title: Re: EL7144C second source Post by: W4AMV on May 01, 2018, 10:52:23 AM Thanks, I'll check it out! Alan
Title: Re: EL7144C second source Post by: W4AMV on May 02, 2018, 11:18:40 AM This device looks like it would fit the bill. Although it is specified with a pulse input drive. I assume I either pre shape a sine wave input or slightly overdrive. Does the device function well with sine input? Thanks, Alan
Title: Re: EL7144C second source Post by: steve_qix on May 13, 2018, 08:56:11 AM Hmm. I took a look at the ratings. Has anyone used these to drive a fairly big MOSFET such as an FQA11N90 with 2700pF of input capacitance? AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Just curious. The max steady-state current is fairly low and the internal resistance is not all that low. Might work into a single device on 80 meters. Not so sure about 40 meters, where the input impedance of the MOSFET would be in the order of 7 ohms. Maybe. Has anyone tried this? Interesting !! Regards, Steve |