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Author Topic: Hi, is they any op amp with pin 4 as positive and ground as pin 7 ?  (Read 921 times)

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Offline nyameTopic starter

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Hi, is they any op amp with pin 4 as positive and ground as pin 7 ?
« on: June 28, 2018, 03:55:16 pm »
Hi, please i wish to know if there is any op amp with pin 4 as positive and pin 7 as ground ?
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Offline awallin

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Re: Hi, is they any op amp with pin 4 as positive and ground as pin 7 ?
« Reply #1 on: June 28, 2018, 04:03:32 pm »
that looks like a typo in the instructions..
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Offline wraper

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Re: Hi, is they any op amp with pin 4 as positive and ground as pin 7 ?
« Reply #2 on: June 28, 2018, 04:25:19 pm »
Particular op amp is mentioned (741). And it's explicitly said to connect "+" of the battery to the "-" pin of the op amp, and the same nonsense for other power pin. Therefore what written is incorrect.
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Offline Audioguru

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Re: Hi, is they any op amp with pin 4 as positive and ground as pin 7 ?
« Reply #3 on: June 29, 2018, 12:01:27 am »
Many lousy old 741 opamps (designed 50 years ago to use a 30V supply) do not do anything with a 9V supply and a 9V battery quickly drops to below 6V.
Use a modern opamp that works with a 5V to 9V supply.
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