Comments on: Op-Amp IC Circuit Tester https://jestineyong.com/op-amp-ic-circuit-tester/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Mon, 03 Nov 2014 16:01:50 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: gcharal https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228697 Mon, 03 Nov 2014 16:01:50 +0000 https://www.jestineyong.com/?p=8552#comment-228697 Hello Andre,

thanks for this good article.
But I have a question.
What is the purpose of the R3 resistor?
Thanks again.
George

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]]> By: l.boopathiraj https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228675 Sun, 02 Nov 2014 13:48:24 +0000 https://www.jestineyong.com/?p=8552#comment-228675 DEAR SIR
yes lot of op amp IC's available in the market here is some popular
IC's LM 741 this is common for all type of projects single op amp LM 358 dual op amp using sub woofer and LM 324 LM 339 contains like four op amps, ic s are different pin outs (refer only data) op amp IC's need dual power supply for best performance and normal power supply its ok

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228635 Fri, 31 Oct 2014 18:02:33 +0000 https://www.jestineyong.com/?p=8552#comment-228635 In reply to Humberto.

Thanks Humberto

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228634 Fri, 31 Oct 2014 18:01:55 +0000 https://www.jestineyong.com/?p=8552#comment-228634 In reply to beh.

Hi beh yes you need diagram for pin layout... but this diagram is just to explain how the IC works so you can check it directly on the board and see what input and outputs you get. Ic in my country are quite expensive as lm339 can go for 14 to 18 bucks here. so it is beneficial to test it before I wast good money.

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228615 Fri, 31 Oct 2014 17:29:11 +0000 https://www.jestineyong.com/?p=8552#comment-228615 In reply to Robert.

Thanks Robert.

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228614 Fri, 31 Oct 2014 17:28:26 +0000 https://www.jestineyong.com/?p=8552#comment-228614 In reply to Mark.

Hi Mark thank you... As I mention in my schematic i use an LM339 which pin 3 is Vcc, 12 is Ground, 6 is input 2- and pin7 is input2_ with pin1 as out put2. In the picture pin 4 is Vcc and pin 11 is ground, If you pull up the Data sheet for both IC you will see what I am talking about.

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228613 Fri, 31 Oct 2014 17:22:09 +0000 https://www.jestineyong.com/?p=8552#comment-228613 In reply to Eugenijus Skardzius.

it is basically the same thing. Thank you.

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228612 Fri, 31 Oct 2014 17:21:11 +0000 https://www.jestineyong.com/?p=8552#comment-228612 In reply to Sethu ramachandran.

Hi Sethu Thanks you... In the schematic I used an LM339 and In the picture I use a LM224 IC, so pin connection are different. In LM339 pin 3 is power and Lm224 pin 4 is power. Hope this clear it up for you.

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228611 Fri, 31 Oct 2014 17:18:07 +0000 https://www.jestineyong.com/?p=8552#comment-228611 In reply to Jayant Gholba.

exactly what I explain to Jackie. Thank you and your welcome.

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]]> By: Andre Gopee https://jestineyong.com/op-amp-ic-circuit-tester/comment-page-1/#comment-228610 Fri, 31 Oct 2014 17:16:52 +0000 https://www.jestineyong.com/?p=8552#comment-228610 In reply to Yogesh Panchal.

Your welcome

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