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Old 2nd September 2013, 07:45 PM   #21
PChi is offline PChi  United Kingdom
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Quote:
Originally Posted by RNMarsh View Post
Do you have the 725C analog input stage amplifier drawn? Curious what the circuit looks like.

Thx-RM
No I haven't drawn the 725C analogue input stage. If no one is interested in the ShibaSoku I might get around to it. I believe that it is only single ended though. A fair bit of the magic is going to be in the layout.
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Old 2nd September 2013, 08:38 PM   #22
1audio is offline 1audio  United States
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I fully intend to do the same for mine. I'll try to get started this weekend. I suspect the circuit will be very similar to the oscillator.
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Old 8th September 2013, 03:25 PM   #23
davada is offline davada  Canada
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PChi can you determine the number of sample per cycle the 725 uses? I would like to know what the minimum number required to capture the 5 harmonics is.
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Old 8th September 2013, 03:40 PM   #24
davada is offline davada  Canada
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Rick I have a friend who has a son living in Tokyo. I might be able get her to ask Frank if he can have a look around for the manual. Give me the model revision number you're after.
He might say no but it's worth a try.
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Old 8th September 2013, 05:43 PM   #25
RNMarsh is offline RNMarsh  United States
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It is a model AD725D, S/N is M-61518002

The rep in USA is not able to get us any manuals. Tektronix bought out a repair depot in California and they will calibrate the analyzer (repair as well, I presume?). Of course, they wont give out manual or copies or schematics, either.
Governments should be so lucky with keeping thier secrets.

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Old 8th September 2013, 05:47 PM   #26
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by PChi View Post
No I haven't drawn the 725C analogue input stage. If no one is interested in the ShibaSoku I might get around to it. I believe that it is only single ended though. A fair bit of the magic is going to be in the layout.
The circuitry has interest or potential application in audio preamp design.

-Thx-RM
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Old 8th September 2013, 06:35 PM   #27
davada is offline davada  Canada
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I'm particularly interested in the sampling section. Don't see any reason why after sampling the signal can't stay in the digital domain. A DSP can handle the rest. The output from the DSP can be re-clocked to an standard audio sample rate and bit depth, converted to an SPDIF or I2S and sent to a comp via sound card technology. Common sound card apps can be used.The output would be a fixed frequency placed at the best view in a standard FFT app.
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Old 8th September 2013, 07:39 PM   #28
davada is offline davada  Canada
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Quote:
Originally Posted by RNMarsh View Post
It is a model AD725D, S/N is M-61518002

The rep in USA is not able to get us any manuals. Tektronix bought out a repair depot in California and they will calibrate the analyzer (repair as well, I presume?). Of course, they wont give out manual or copies or schematics, either.
Governments should be so lucky with keeping thier secrets.

Thx-RM
Okay I sent the email off we'll see what happens.
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Old 8th September 2013, 08:51 PM   #29
davada is offline davada  Canada
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Rick I just found this on Ebay.

shibasoku AD725 | eBay

The link doesn't work. There's new listing on ebay for a 725B manual with schematics.
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Last edited by davada; 8th September 2013 at 08:53 PM.
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Old 8th September 2013, 09:24 PM   #30
1audio is offline 1audio  United States
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Too late- I just bought it. I'll scan it and make the file available when I get it. Should be very interesting. He relisted it instantly. . .
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