AW: [basicstamps] Frqout problems
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Posts: 46,084
Hi Tracy,
thanks for your help. The filter would have to be like this, right?
pin out >
|/\/\/\|
> frequence
|
|
---
---
|
|
GND
If not, please let me know.
Best regards, Uli
Urspr
thanks for your help. The filter would have to be like this, right?
pin out >
|/\/\/\|
> frequence
|
|
---
---
|
|
GND
If not, please let me know.
Best regards, Uli
Urspr
Comments
circuit around. The resistor goes between the stamp pin and the
capacitor.
1.5kohm smoothed
stamp pin out >----/\/\/\--o---> frequency out
FREQOUT | to 'scope
1khz to 10 khz |
===== 0.01
|
|
GND
With R=1.5k and C=0.01uF the 3db point (1/2 amplitude) is about 10.6
khz. F = 1/(6.28*R*C)
The output from the circuit should feed a high impedance load >
1Mohm. Use a buffer amplifier if the load is low impedance.