Transistor/Transducer

[Steve Harrison]

At 12:31 PM 1999-12-18 EST, Hal Korff wrote:
>All items are from the Heath GD-1151 Ultra Sonic Cleaner.

THAT part skipped by me. Knowing that, then:

>The DTS409 Transistor (Heath 417-814). The ECG388 & NTE388 "equivalents" are
>not. The lighter gauge metal in their cases and their weight imply they are
>not equivalent ito the DTS409 in their power ratings.

If memory serves right, the DTS409 was a high-voltage transistor that W6GGV
and I used in many 350 volt DC shunt regulators for tetrode power
amplifiers. The power rating on this guy, in this application, is probably
not critical, although avoiding secondary breakdown might be. Over a year
ago, my father, who has another model ultrasonic cleaner, tried a 2SC1308
Horizontal Output transistor from Radio Shack in his cleaner. Says it works
fine still. If you already have the ECG parts, try them. The RS part is
around $6.88 or something. There are cheaper devices out there that will do
the same job, too.

>A 2" Dia. "Lead-Titanate-Zirconate-Transducer". Quotes enclose the only
>description Heath published on the transducer which they had attached
>(epoxyed) to the tank.

I don't know where you'd find these; but I'd try searching for ultrasonic
cleaner transducers in Thomas Register as KL7FM suggested, or on the web.
They're definitely out there since ultrasonic cleaners haven't yet been
replaced by a Pentium III, although without doubt, we will shortly learn
that all these decades, the sole reason that last speck of dirt lodged
between the stone and ring could not be dislodged was because you weren't
using an Intel product to "think" it out :o)))))))

You probably need to have some idea of the power of your machine (I don't
know what terminology they might use in describing the capabilities of
these devices); maybe your manual says something along that line in some way.

An idea: try MCM Electronics of Centerville, Ohio, 1-800-543-4330. They're
a technician's replacement part stockhouse specializing in consumer
appliance parts. I didn't see such a transducer in the index but perhaps
they'll have something or know where to find it. There are other such
places, too, like Hosfelt and even, maybe, DigiKey.

>Mylar type capacitors...I find NONE listed in Newark's #117 catalog. Are they
>victims of the EPA? What is best substitute?

As KL7FB said, Orange Drops outta work just fine.

You can think of the Ultrasonic Cleaner as a moderate-powered
high-audio-frequency oscillator; nothing really critical about them.
Somebody may have let the fluid "boil" dry which leaves the transducer
without a load.

73, Steve K0XP

Sponsored by the City of Tempe 

Listserver Submissions:  heath at listserv.tempe.gov
Listserver Subscription: listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"