i would like ask some questions about the circuit.this circuit is taken from thegimmick guitar tuner project.
1.what is the functions of each of the capacitor C1,C5.C6,C8 and the one in E3?below is my guessing:
C1:to filter out the dc component from the signal source.
C5&C6:to make sure the oscillator start up correctly.but what is the theory behind that?
C8 and the one inside E3:i don't know...
2.i know E2 is a multiple feedback filter,but why it uses this topology instead of others?
3.is the function of the potential divider below E1 is to provide a reference voltage to E1?then why it also connected to pin 5 of tl072 in E2?
4.the bridge rectifier at the bottom is b80c800,but i can't find this component.can i replace it with four 1n4007 diodes?
5.can somebody explain the working principle of the comparator?and why it is connected like that?(how to determine the resistor value and the resistor capacitor configuration as well.)
thanks in advance.
1.what is the functions of each of the capacitor C1,C5.C6,C8 and the one in E3?below is my guessing:
C1:to filter out the dc component from the signal source.
C5&C6:to make sure the oscillator start up correctly.but what is the theory behind that?
C8 and the one inside E3:i don't know...
2.i know E2 is a multiple feedback filter,but why it uses this topology instead of others?
3.is the function of the potential divider below E1 is to provide a reference voltage to E1?then why it also connected to pin 5 of tl072 in E2?
4.the bridge rectifier at the bottom is b80c800,but i can't find this component.can i replace it with four 1n4007 diodes?
5.can somebody explain the working principle of the comparator?and why it is connected like that?(how to determine the resistor value and the resistor capacitor configuration as well.)
thanks in advance.
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