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Old 28th June 2013, 10:24 AM   #1
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Default Standard generator 1khz-1V

Hello everyone!

I need to make a standard 1khz generator 1v to set up an amplifier and I found this simple scheme that interests me.

Crystal-controlled 1KHz generator - top electronics

The problem is that I do not know if this arrangement achieves these 1Volt or if it exceeds.
What do you think?
Maybe you have other scheme proposal!

Regards!
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Old 28th June 2013, 10:30 AM   #2
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by Project16 View Post
Hello everyone!

I need to make a standard 1khz generator 1v to set up an amplifier and I found this simple scheme that interests me.

Crystal-controlled 1KHz generator - top electronics

The problem is that I do not know if this arrangement achieves these 1Volt or if it exceeds.
What do you think?
Maybe you have other scheme proposal!

Regards!
It will exceed it. The output will be a square-wave that has a low of 0V and a high of 5V, if a 5V supply is used. This is the same as 5Vpp with a 2.5Vdc offset. Probably not what you want.
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Old 28th June 2013, 01:48 PM   #3
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Have a look on.......redcircuits.com
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Old 28th June 2013, 01:54 PM   #4
Mooly is offline Mooly  United Kingdom
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Use (or for example make your own with Audacity) a test CD. It will be far lower distortion than most simple circuits and you can make any frequency you want up to 20Khz.
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Old 28th June 2013, 07:01 PM   #5
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Thank you all!

I had not actually thought about this possibility with audio software.

Regards!
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Old 2nd July 2013, 07:31 PM   #6
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Hi ...

If you want something that can also be used as a reference for distortion measurements then might this be interesting to you:

Ultra low distortion ( 0.00001%) 1kHz sine generator assembled and tested PCB | eBay

Best regards,

Jesper
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Old 21st August 2013, 05:47 PM   #7
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Originally Posted by Mooly View Post
Use (or for example make your own with Audacity) a test CD. It will be far lower distortion than most simple circuits and you can make any frequency you want up to 20Khz.
Sorry to jump in here, but how would you ensure the 1v level?

Thanks
John
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Old 21st August 2013, 06:32 PM   #8
Mooly is offline Mooly  United Kingdom
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Originally Posted by KC2ZPK View Post
Sorry to jump in here, but how would you ensure the 1v level?

Thanks
John
That's a good question... and the answer is that you can't as such. That's because all players have different output levels. What we normally record as a test tone would be at the 0db level, a level that uses the full dynamic range available to us. When that disc is played back you see a voltage level that is unique to each player such as 2.1 volts 1.9 volts, maybe 1.4 volts on a portable etc.

Having said that its easy to record a tone of say 100 to 400hz (that falls within any DVM's frequency range) and then have an external adjustable buffer and set the level to 1.00 volts. Accuracy limited only by the DVM. Having done that, any frequency on the disc will be at that same level to the accuracy of the players DAC and filters... usually fractions of a db.
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Old 21st August 2013, 07:54 PM   #9
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Originally Posted by Mooly View Post
That's a good question... and the answer is that you can't as such. That's because all players have different output levels. What we normally record as a test tone would be at the 0db level, a level that uses the full dynamic range available to us. When that disc is played back you see a voltage level that is unique to each player such as 2.1 volts 1.9 volts, maybe 1.4 volts on a portable etc.

Having said that its easy to record a tone of say 100 to 400hz (that falls within any DVM's frequency range) and then have an external adjustable buffer and set the level to 1.00 volts. Accuracy limited only by the DVM. Having done that, any frequency on the disc will be at that same level to the accuracy of the players DAC and filters... usually fractions of a db.
Ok, bear with me.... I am going to have some questions
I can use Audacity to generate any tone, 1kHZ for this example, 'normalize to 0db' then save that track to my MP3(or other). Now play this track and measure the output with a DVM? But it will be out of the headphone jack, which will be higher than 1v. Could you use an op-amp buffer to set this level? either higher or lower? Line out would probably be better? Can I assume the line outs usually do not have any equalization done to it, such as bass boost?

Thanks
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Old 21st August 2013, 09:44 PM   #10
Enzo is offline Enzo  United States
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It is 1kHz, there is no bass to boost. If all you are doing is recording a 1kHz tone, then as long as it records it cleanly, it doesn't much matter what the rest of the audio range does. If your player makes the same volume every time, then it will play at the same level every time.
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