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 Forum index » DIY Hardware and Software » Thomas Henry designs
XR-2206 VCO problems
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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Wed Jul 30, 2014 10:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Now I double checked all soldering and ground .. even the +-15V all seems propper so no cold solder found ...
Changed the XR2206 .. same behavior .. only noise ... Mad

so I will give up on this board and solder some other VCOs I have around Sad
Maybe one day I will go back on this or even solder the second board that I have

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greetings from belgium, Sascha

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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Mon Aug 04, 2014 11:55 am    Post subject: Reply with quote  Mark this post and the followings unread

o.k. still can't get my hands off this thing ..

it seems that some resistors are bad manufactured ....
some 10k only tell me 6,0k, some others also with wrong value .. so I will go on debugging tonight

OMG DIY is a drug Very Happy

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My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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elmegil



Joined: Mar 20, 2012
Posts: 1509
Location: Chicago
Audio files: 14

PostPosted: Mon Aug 04, 2014 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Are you measuring the resistors while they are soldered into the circuit? This can affect what resistance reading you get checking them. For example if my circuit somehow had two 10k resistors going from a common point to ground, measuring one would show me 5K instead because they would be parallel to each other.

You generally can only be sure you're measuring just the resistor in question if you lift one of the legs out of the circuit.

If you meant you measured those in the batch you selected from, without being in a circuit, disregard all that Smile
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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Mon Aug 04, 2014 12:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the hint elmegil ... yes, I have exaclty that effect . so I will desolder one leg an check them again ...

else it must be the XR2206 that is not well working

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My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Tue Aug 05, 2014 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

IT WOOORKS

had a little visit at serendai today ... he managed to fix the XR2206 .. I soldered one tansistor in wrong direction aaand the XR2206 was broken ..

thanks a lot Bernd for your help

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My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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elmegil



Joined: Mar 20, 2012
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PostPosted: Tue Aug 05, 2014 6:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome Smile

Good to hear....
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