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Old 31st August 2011, 11:45 AM   #601
danzup is offline danzup  Romania
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Quote:
Originally Posted by jorgovanko View Post
Can you briefly explain why? Thanks.
That last one is the inter-stage attenuator and it is like in my schematics if you want the whole attenuator to work properly for our years !
It is like this :
R5----------R4--------R3-------R2--------R1-------R0
-32dB --- -16dB ---- 8dB ---- 4dB ---- 2dB ---- 1dB
stage attenuation
at 63dB all are off
at 62dB only R0 is on rest off
at 61dB R1 on rest off
at 60dB R0 and R1 is on rest off
.......
at 0dB all R are on.
As for the 1dB stage is like that for smoother transition between stages .
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Old 31st August 2011, 12:47 PM   #602
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Quote:
Originally Posted by danzup View Post
That last one is the inter-stage attenuator and it is like in my schematics if you want the whole attenuator to work properly for our years !
As for the 1dB stage is like that for smoother transition between stages .
OK, now it is clear why is the first relay connected with resistors in this way. Its seems that always we must have resistor in series with signal for this type of attenuation. Thanks.

Last edited by jorgovanko; 31st August 2011 at 01:07 PM.
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Old 31st August 2011, 09:19 PM   #603
RS232 is offline RS232  United Kingdom
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Atmega arrived today
Now waiting for the encoder so I can start prototyping.

Ric
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Old 3rd September 2011, 01:26 PM   #604
RS232 is offline RS232  United Kingdom
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Still have a few things missing but going to start with what I have...
One question:
Some were in the tread danzup mentions a soft for the 8515 to read the codes from the remote controls (to identify codes) but I read the complete tread twice and I can find it.
Can anyone tell me were it is ?

Thanks
Ric
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Old 5th September 2011, 07:28 AM   #605
danzup is offline danzup  Romania
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I will post here a new project : an Atmega IR remote transmitter that is 100% compatible with any project , that way you must not search for an compatible IR remote transmitter .
@RS232 : i will check and if there is not I will post again that firmware .
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Last edited by danzup; 5th September 2011 at 07:32 AM.
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Old 7th September 2011, 10:38 AM   #606
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Hi everyone,
I connect the first relay with resistors as shown in datasheet and the situation has improved. Attenuation of the signal now goes noticeably better, does not even have any unwanted overtones in the signal coming out of the attenuator (the signal gnd is connected to ground of Atmega). But the clicks are evident during the amplification / reduction, from 32 to 63 steps. With signal amplification, the clicks are more pronounced. You can hear them from loudspeakers . I dont have any DC from the source. Probably the clicks are present throughout the scale, but till the 31 step they are hidden with attenuation of the last relay (390k resistor on the signal line). Question, is the relay clicks present in your system after step 31? Thanks.

Last edited by jorgovanko; 7th September 2011 at 10:51 AM.
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Old 10th September 2011, 12:42 PM   #607
tsip is offline tsip  Greece
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yes i get also clicks past 31 but cant troubleshoot it, so i have learned to like it
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Old 13th September 2011, 07:15 PM   #608
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Is there a solution to this "problem" or have to be so?
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Old 14th September 2011, 06:31 AM   #609
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Default R2R Audible Clicking

I didnt solder my R2R VC version but reading russian audio forums I would like to say that there is a solution for this problem and there are some resons for this problem to be.
1. Resistors values match.
2. High input resistance of the next stage after VC.

1. Check all resistors values you are using.
2. If input resistance of the next stage higher then 10k try to reduce it.
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Old 21st September 2011, 12:33 PM   #610
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I found one article that mentioned the problem of audible clicks from the speakers and the solution to the problem.

https://docs.google.com/document/d/1...PMY/edit?hl=en
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