A Look Inside #15 - Faulty Audio Frequency Standard OCXO, Fixed!

A Look Inside #15 - Faulty Audio Frequency Standard OCXO, Fixed! - Pt1

Рет қаралды 4,565

4 жыл бұрын

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A look inside / teardown of a faulty Audio Frequency Standard OCXO. I manage to trace and fix the problem in Part 2.
Datasheets:
* 74HC393 - Dual 4-bit binary ripple counter:
assets.nexperia.com/documents...
* 5351B - I2C-PROGRAMMABLE ANY-FREQUENCY CMOS CLOCKGENERATOR + VCXO:
www.silabs.com/documents/publ...
* AD823 - Dual, 16 MHz, Rail-to-RailFET Input Amplifier:
www.analog.com/media/en/techn...
* AD586 - High Precision5 V Reference:
www.analog.com/media/en/techn...
* Atmel ATmega8A - 8-bit AVR Microcontroller:
ww1.microchip.com/downloads/en...
* HMC549MS8GE - DUAL OUTPUT LOW NOISEAMPLIFIER:
www.analog.com/media/en/techn...
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Music clip from KZfaq Music Library - Phase Three by Huma-Huma
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Пікірлер: 13

@mjlorton 4 жыл бұрын

The actual "Look Inside" starts at 3:45. I forgot to add that in the video....

@pulesjet 4 жыл бұрын

In the Military I worked with and on a AN UCC-4 Multiplex system. It used 96Kz as the Pilot Frequency. The Pilot was used by any and all multiplexes in tandem to derive the translation of all carrier channels. That board looks like a modern version of the ones we used. The Module may have originated as surplus or spare parts for the same. *** We used a Cesium Clock at the originating facility. If You have no output it would be because your not feeding it the 10Mhz from a atomic clock. en.wikipedia.org/wiki/AN/UCC-4

@ChrisSmith-tc4df 4 жыл бұрын

It’s difficult to tell without higher magnification, but it would appear that there’s allot of solder paste that doesn’t appear to be fully reflowed and certainly not cleaned away. I suspect that there are some dodgy solder joints amongst those, and that may explain how it may have worked during QA, but not when it arrived to you. I guess that you will let us know part 2 what you finally found.

@dennisolsson3119 4 жыл бұрын

You mention you want a frequency divider... Wouldn't something like two deca counter logic circuits in series do the job? They each divide by 10, so 10Mhz to 100khz.