ranggaperdana_06114
Member level 3
Heartbeat Monitor
how if i use resistor film ? it's better isn't it?
how if i use resistor film ? it's better isn't it?
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100 years ago all resistors were "carbon composition". They were horrible.ranggaperdana_06114 said:how if i use resistor film ? it's better isn't it?
Fo of the notch filter is calculated with the formula when the resistors and capacitors have the correct ratios (your resistors are not).ranggaperdana_06114 said:it's fo located between R3 and C8 ?
how i can calculate the gain at R9 and R10?
I mentioned the lousy old 741 opamps on August 9th.LvW said:Hi AUDIOGURU !
I am surprised, didn´t you forget something ?
You show as a circuit with the 741 opamp without saying that it is a lousy old amplifier ?
(Don´t be angry; but you certainly know that I am joking).
LvW
aredhel said:Hahahaha, thank you Audioguru. The circuit works now. Anyway I have a question on PCB design where I did a PCB with a polygon plane pouring all over the ground connections and another without it.
The one without the ground polygon plane gives a much "cleaner" output compared to the one with the ground polygon plane. Do you know what might be the reason ... is EMC and all that harmonics some of the reason and the plane is acting like an antenna?
Attached are images of the PCB design. The ground plane is poured on the bottom layer where the tracks are.
Thank you.
aredhel said:Hahahaha, thank you Audioguru. The circuit works now. Anyway I have a question on PCB design where I did a PCB with a polygon plane pouring all over the ground connections and another without it.
The one without the ground polygon plane gives a much "cleaner" output compared to the one with the ground polygon plane. Do you know what might be the reason ... is EMC and all that harmonics some of the reason and the plane is acting like an antenna?
Attached are images of the PCB design. The ground plane is poured on the bottom layer where the tracks are.
Thank you.
Audioguru said:Some have a frequency range of 0.03Hz to 100Hz.