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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  tl072 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: tl072  (Read 2774 times)
newperson
Posts: 457


WWW
tl072
« on: June 25, 2012, 01:12:49 AM »

Hi,
What is the smallest circuit that could be build to use as a test circuit for a TL072 IC?
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gregwbush
Posts: 103


Re: tl072
« Reply #1 on: June 25, 2012, 04:22:04 AM »

The simplest circuit i have built with a tl072 (dual op amp) uses just one of the op amps and is the AMZ op amp buffer

http://www.muzique.com/news/opamp-buffer-layout/

That'll tell you if it works... (assuming that's what you mean by test circuit... if not, please elaborate!)
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Solid state isn't that bad, is it? http://youtu.be/A_ObPhEnsmY
newperson
Posts: 457


WWW
Re: tl072
« Reply #2 on: June 25, 2012, 10:26:08 AM »

Thanks for the reply.  I think I would need something using both sides of the amp to make sure the ICs fully work.  And yes this is what I am looking for in a 'test circuit.'

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LucifersTrip
Posts: 2617


^^ Fuzz Skull ^^


WWW
Re: tl072
« Reply #3 on: June 25, 2012, 01:25:35 PM »

can't you just hook up the same circuit separately for both sides of the opamp?
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always think outside the box
gregwbush
Posts: 103


Re: tl072
« Reply #4 on: June 25, 2012, 05:49:21 PM »

It would be very unlikely that if the chip works, one half of it doesn't, but i understand you want peace of mind  Wink

You could do as LucifersTrip suggests and build a dual buffer

As it happens, i did a vero (strip-board) layout some time ago for one... I'm just labeling components better for you now, and i'll post it....

Ok here it is
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Solid state isn't that bad, is it? http://youtu.be/A_ObPhEnsmY
jk-fm
Posts: 24


Re: tl072
« Reply #5 on: June 25, 2012, 07:57:35 PM »

Triangle oscillator! 3 resistors, 1 cap, + 2 resistors for vref
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gregwbush
Posts: 103


Re: tl072
« Reply #6 on: June 25, 2012, 10:00:23 PM »

you can plug a guitar into mine  Grin
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Solid state isn't that bad, is it? http://youtu.be/A_ObPhEnsmY
pufferton
Posts: 55


Re: tl072
« Reply #7 on: August 11, 2013, 07:30:28 PM »

It would be very unlikely that if the chip works, one half of it doesn't, but i understand you want peace of mind  Wink

You could do as LucifersTrip suggests and build a dual buffer

As it happens, i did a vero (strip-board) layout some time ago for one... I'm just labeling components better for you now, and i'll post it....

Ok here it is


has this build been tested and verified? im trying to build it and running into grounding issues...(continues popping and LED flashes) but not seeing any issues with it...
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psychedelicfish
Posts: 464


Edward B.


Re: tl072
« Reply #8 on: August 11, 2013, 10:36:01 PM »

has this build been tested and verified? im trying to build it and running into grounding issues...(continues popping and LED flashes) but not seeing any issues with it...
The layout looks perfectly fine to me. Are you sure you've wired everything correctly and that there are no solder bridges, badly cut traces etc.? Popping might suggest a backwards electrolytic capacitor, I would recommend checking you have all of them correctly oriented
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If at first you don't succeed... use bigger transistors!
pufferton
Posts: 55


Re: tl072
« Reply #9 on: August 13, 2013, 02:51:44 PM »

just triple checked everything...had some issues, fixed them but still the same problem....would it do this if i had a bad component? i removed the board from the chain and i get 9v from the dc jack and LED shines steady. no 1/4" jacks are hooked as of right now.  as soon as i wire everything back up its flashes and i get 1-2v reading.
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pufferton
Posts: 55


Re: tl072
« Reply #10 on: August 13, 2013, 03:06:44 PM »

has this build been tested and verified? im trying to build it and running into grounding issues...(continues popping and LED flashes) but not seeing any issues with it...
The layout looks perfectly fine to me. Are you sure you've wired everything correctly and that there are no solder bridges, badly cut traces etc.? Popping might suggest a backwards electrolytic capacitor, I would recommend checking you have all of them correctly oriented

http://postimg.org/gallery/alul4cjk/

so it looks extreamly messy cause i have taken it apart 4-5 times.... 

any idea??
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davent
Posts: 2049


dave c. -Hammer Mtn. ON


Re: tl072
« Reply #11 on: August 13, 2013, 03:33:17 PM »

Tangentsoft's IC tester. Can be built to test single, dual or quad opamps.

http://tangentsoft.net/elec/opamp-tester.html
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"Turn it up to 10 and rip off the knob."- Patterson Hood
stallik
Posts: 341


Kevin S - Huntingdon UK


Re: tl072
« Reply #12 on: August 13, 2013, 04:16:12 PM »

Hey! A duplicate post... Ic still looks to be upside down
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Insanity: doing the same thing over and over again and expecting different results. Albert Einstein
pufferton
Posts: 55


Re: tl072
« Reply #13 on: August 13, 2013, 04:21:17 PM »

Hey! A duplicate post... Ic still looks to be upside down

sorry about the duplicate. i was dealing with two different things and the problems converged. i will try switching it tomorrow. thanks so much for your help!!
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stallik
Posts: 341


Kevin S - Huntingdon UK


Re: tl072
« Reply #14 on: August 13, 2013, 04:24:58 PM »

No worries, I thought I was having a de ja vu moment - I've had them before
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Insanity: doing the same thing over and over again and expecting different results. Albert Einstein
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