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 Forum index » DIY Hardware and Software » YuSynth
Adsr v2
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Karlisss



Joined: Apr 20, 2015
Posts: 25
Location: Latvia (EU)

PostPosted: Mon May 11, 2015 8:44 am    Post subject: Adsr v2
Subject description: Bc547c vs bc546a/b
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Can i use bc546a or bc546b instead of bc547c in yusynth adsr v2?
I googled but i cant understand datasheet parametr comparison.
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gdavis



Joined: Feb 27, 2013
Posts: 359
Location: San Diego
Audio files: 1

PostPosted: Mon May 11, 2015 2:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Should work. There are two basic differences:

1. The maximum collector-emitter and collector-base voltages are greater in the 546, meaning it can tolerate higher voltages than the 547 which isn't a factor in the ADSR since they're only connect between 15V and GND.

2. The current gains (hFE) are different, with A being the smallest and C being the largest. In the ADSR they aren't intended to be used in the active region so the current gain isn't critical. Even the minimum gain of 110 looks like it will work.

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Karlisss



Joined: Apr 20, 2015
Posts: 25
Location: Latvia (EU)

PostPosted: Mon May 11, 2015 9:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you.
Will be report
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Karlisss



Joined: Apr 20, 2015
Posts: 25
Location: Latvia (EU)

PostPosted: Tue May 19, 2015 4:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok. I bilt one adsr v2 with slow jumpers.
And bc546a instead of 547
But here is a strange thing:

Output works with background "non excluded audio signal" duno howto describe it precise. So there is a silence only before first trigger, after next trigger (no matter is it trigger input or switch) there is a background sound.

Thing is adsr works as it should work, if i connect output directly to tl074 pin3, then is silence between "actions" .
Can it be cos i use 546a? Or something wrong with 555?

Also led diode, dont work in expected place, diode works when i put it in different place, as it shown in drawing.

So somehow my adsr works great,also no problem with invert output at all, but i would like to complete project as it should be. When output goes from right place and led is connected to right place.

Any ideas?


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gdavis



Joined: Feb 27, 2013
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PostPosted: Tue May 19, 2015 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

If I remember correctly, the direction of the LED and D5 are reversed in the schematic and diagram. Try switching them around (LED cathode to pin 7, anode to pin 6, D5 anode to pin 7, cathode to pin 6).
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Karlisss



Joined: Apr 20, 2015
Posts: 25
Location: Latvia (EU)

PostPosted: Sat May 23, 2015 1:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

wolaaaaa!!
Thank you very much!
Now my ADSR2 works as expected!!

now i have to finish my other adsr v2 pcb and panels.
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