Hello, I am a person who is going to conduct an amplification circuit experiment using the instrumentation amplifier ad620 element.
The circuit diagram says that +9V -9V voltage should be applied to the ad620 device, but I don't know how to apply the -9V negative voltage. Please advise on the simplest way to apply +9V ,-9V voltage.
And, if possible, it would be appreciated if you could explain why you need to apply two + and - voltages.
If the input signal is +, negative voltage is not needed, but if + and - are swinging around 0V, positive power is needed to amplify both sides. And in most cases of OPAMP, both power supply is basic.
When performing OPAMP experiments, it is recommended to use a linear type power supply rather than the same as SMPS. Schools and companies often use power supplies that support both power sources.
http://www.powertm.co.kr/html/pro01_dcpower_01_ope_q.htm
If you like decorating circuits, try making your own.
If you use 7809 and 7909 instead of 7815,7915 above, you get ±9V.
Otherwise, buy two 9V adapters and connect one side with + and the other side like this (+)(-) -- 0V -- (+)(-)
If it is set to 0V (COM), it becomes positive power.