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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 25th Sep 2019, 4:24 pm   #1
Marconi_MPT4
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Default Zeltex and Computing Techniques Differential Amplifiers

I started looking for information on Zeltex 116C and Computer Techniques 0F720A differential solid state amplifiers. Have found a Zeltex short-form catalogue dated 1966 which only lists brief specifications for types 116 and 116B.

Would I be right in thinking these can be wired in the same way as modern day op-amps?

Any ideas on who Computing Techniques were, as so far an internet trawl has drawn a blank.

Cheers
Rich
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Old 28th Sep 2019, 6:35 pm   #2
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Default Re: Zeltex and Computing Techniques Differential Amplifiers

Quick update FWIW.

Further research on Zeltex 116 suggests this could have been made by Philbrick Researches, Inc. in Massachusetts USA. Comparing data sheets of both products show almost identical parameters and pin-out. Trim input is tied to V+ via a 50k potentiometer.

Given the scarcity of information of these parts and enthusiastic response so far moderators, please close this thread. Thanks
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Old 28th Sep 2019, 6:53 pm   #3
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Default Re: Zeltex and Computing Techniques Differential Amplifiers

Hi Rich, I have some amps like these, Teledyne 705 ? I think. They come with a label on the block stating the value of the balance resistor to be used.
I believe they were used on the Blue Streak programme as part of the telemetry / instrumentation circuits. The spec sheet shows that they had extreamly good characteristics for a hybrid (pre IC days) amp.

Ed
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Old 28th Sep 2019, 7:14 pm   #4
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Default Re: Zeltex and Computing Techniques Differential Amplifiers

Rich

I have four similar Computing Techniques Op-Amps, but no data other than the product labels. These ones have a metal heat sink.

Ron
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