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From: miked@syscon (Mike DeMetz)
Newsgroups: rec.models.rc,sci.electronics
Subject: Re: what transistors in my Futaba MC112B?
Message-ID: <1991May23.131858.5024@syscon>
Date: 23 May 91 13:18:58 GMT
References: <1991May22.215112.13541@hamblin.math.byu.edu>
Organization: Syscon International
Lines: 24

chad@oscar.cs.byu.edu (Chad) writes:

>I have a Futaba MC 122B ESC  (electronic speed control) that I was using
>in my (radio controlled) Tamiya 4wd Porsche 959. Anyway, it failed and
>with the help of the head of the BYU CS hardware fix-it lab I identified
>3 of the transistors that were bad and removed them.  Now I need to find
>replacements.  There is no manufacturer's labeling on the transistors
>and only the following numbers:

>S110

>1    79


>That is it.  These are supposedly FET transistors.  We looked in the ECG
>replacment index and found two S110 numbered components but they weren't
>remotely close to  FET transistor.

>Does anyone know what sort of transistors I need to put in this to get
>it going again?  I can't afford to buy a new ESC.

They will be some type of low Rds Power MOSFETS. They should be matched
to remaining good ones if possible.ECG probably does not have them.Try
Digi-Key.