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 Forum index » DIY Hardware and Software
LM324 / LM741 TRI SQUARE VCO | LM741 VC LFP
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2kohm



Joined: Feb 19, 2013
Posts: 49
Location: germany
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PostPosted: Thu Feb 21, 2013 1:09 am    Post subject:  LM324 / LM741 TRI SQUARE VCO | LM741 VC LFP
Subject description: diy synth on breadboard with schematic
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Hello Diyers,

i played around with the LM324 and LM741 opamp!




Schematics (selfdraw) but with the LM741 (works also with other opamps)



LM324 is testet! works like charm.


i have one problem. i add another lm324 in the same config to use as an LFO i get sound from the freq of the lfo and a klicking noise in high freqs in the audio??? is this an error of my PSU? i thnink i have to use a Virtual GND ?

regards.

2kohm


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Last edited by 2kohm on Mon Mar 25, 2013 11:39 pm; edited 1 time in total
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Cynosure
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Joined: Dec 11, 2010
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PostPosted: Thu Feb 21, 2013 5:42 am    Post subject: Reply with quote  Mark this post and the followings unread

It sounds great.

Do you use bypass caps? That might solve the clicking. You should have a 0.1uF cap that goes from the + to the - power pins on each ic. keep the caps as close to the ic as possible.
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2kohm



Joined: Feb 19, 2013
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PostPosted: Thu Feb 21, 2013 7:07 am    Post subject: Reply with quote  Mark this post and the followings unread

THX Very Happy il try it today
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2kohm



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PostPosted: Fri Feb 22, 2013 6:28 am    Post subject: Reply with quote  Mark this post and the followings unread

perfect Very Happy

last night i found a easy way to make an APC out of my circuit!

the "APC" steps can provided also by de resonance Pot from the filter!

lets build the LM324 APC Very Happy

any ideas ?

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2kohm



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PostPosted: Wed Mar 20, 2013 8:38 am    Post subject: schematic with lm324 Reply with quote  Mark this post and the followings unread

schematic


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LM324 tri/sqr OSC
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Scott Stites
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PostPosted: Wed Mar 20, 2013 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's nice work. I also dig your breadboard layout. What are those green switches you're using for keys? I don't think I've seen anything like those before.
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2kohm



Joined: Feb 19, 2013
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PostPosted: Wed Mar 20, 2013 11:12 pm    Post subject:
Subject description: HIGHLY KS01-B-G
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Thanks Very Happy

The Switch
http://www.tme.eu/de/details/ks01-b-g/knopfschalter/highly/#

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Scott Stites
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PostPosted: Thu Mar 21, 2013 10:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool! Thank you.
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baudrate



Joined: Mar 19, 2012
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PostPosted: Fri Mar 22, 2013 7:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Do you have the schematic for the LPF?
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2kohm



Joined: Feb 19, 2013
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PostPosted: Sun Mar 24, 2013 11:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes!
SIMPLE VCF
remove the Diode ( hard clipping and distortion with higher reso)

i used 470K input resitors on pin 3 ( pin 2 works also as input )

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baudrate



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PostPosted: Mon Mar 25, 2013 9:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Sweet! Thank you.
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