crypto museum · 2017. 4. 2. · sw m -25, contact transducer (2117a/1) this contact transducer,...
TRANSCRIPT
![Page 1: Crypto Museum · 2017. 4. 2. · SW M -25, CONTACT TRANSDUCER (2117A/1) This contact transducer, part of the type 2117A kit, has been modified to operate on a lower supply voltage](https://reader034.vdocuments.site/reader034/viewer/2022052023/603939e48207d878af35ecb9/html5/thumbnails/1.jpg)
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SW M -25,CONTACT TRANSDUCER (2117A/1)
This contact transducer, part of the type 2117A kit, has been modified
to operate on a lower supply voltage.
The internal preamplifier nas been replaceu with a two-stage Dipolar
transistor amplifier designed to operate on one mercury cell. The nominal
supply voltage is 1.2 to 1.5 volts. The amplifier draws aoout 34 micro
a m p e r e s a t 1 . 3 5 v o l t s . ' ,
Nominal gain of the internal amplifier is the same as the original FET
amplifier, out the frequency response has been adjusted to afford some high
frequency preerophasi's, as shown on the attached graph. fa
Output impedance of the amplifier is about 3500 ohms, so the amplifier can
orive otner equipment which is designed for miniature microphones .with .
impedances of 2000 to 4000 ohms.
![Page 2: Crypto Museum · 2017. 4. 2. · SW M -25, CONTACT TRANSDUCER (2117A/1) This contact transducer, part of the type 2117A kit, has been modified to operate on a lower supply voltage](https://reader034.vdocuments.site/reader034/viewer/2022052023/603939e48207d878af35ecb9/html5/thumbnails/2.jpg)
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![Page 3: Crypto Museum · 2017. 4. 2. · SW M -25, CONTACT TRANSDUCER (2117A/1) This contact transducer, part of the type 2117A kit, has been modified to operate on a lower supply voltage](https://reader034.vdocuments.site/reader034/viewer/2022052023/603939e48207d878af35ecb9/html5/thumbnails/3.jpg)
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