opamp amplificator

[yalect]

Hello,
I would like to ask you, can we built opamp amplifiacator with LM741 without GND? like in the follow video of radio circuit, I think there is no GND or 0V

thank you

[Zero999]

Hello,
I would like to ask you, can we built opamp amplifiacator with LM741 without GND? like in the follow video of radio circuit, I think there is no GND or 0V

thank you

If you watched the video through to the end, then you'll see it does have a 0V/GND rail.



It's not a very good circuit. The op-amp is not biased properly and demodulation is performed using the PN junctions on the op-amp inputs.

And as far as taking only a minute to make, yeah right? That hand wound coil certainly took a lot longer than a minute to make.

[LvW]

It's not a very good circuit. The op-amp is not biased properly

It`s even worse - the inverting opamp node is floating and there is POSITIVE feedback.

[ebclr]

You can make a virtual ground, just use 2 resistor of 10K or 1k atached one to +Vcc and other the -vcc, and use the midle of those resistor as your ground.


Here a easy way

https://www.aliexpress.com/item/FM-Stereo-Radio-Module-RDA5807M-Wireless-Module-Profor/32667681720.html?spm=2114.01010208.3.18.Hkvjin&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_10000009_10084_10083_10080_10082_10081_10060_10062_10056_10055_10037_10054_10033_10059_10032_10099_10078_10079_10077_426_10103_10073_10102_10096_10052_10050_10107_10106_10051,searchweb201603_2,afswitch_5&btsid=2cf3f8b0-6144-4a7f-a955-53bb1afab08b

[Audioguru]

The input pin numbers of the opamp are shown backwards. Pin 2 is the inverting input and pin 3 is the non-inverting reference voltage input that has no voltage.

[yalect]

If we romove the GND or 0 no connection will work?
Thank you

[Zero999]

If we romove the GND or 0 no connection will work?
Thank you

No, you need a complete circuit for a current to flow, so it won't work if the 0V connection is removed.

Oh and the correct English term is amplifier.