MT8870 DTMF decoder circuit new problem

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heena17

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Output on pin 15 (StD) remains constant as soon as circuit is powered

It should glow only momentarily when powered on and then each time
new tone is fed to the circuit

What this error means ?
 

heena17 said:
Output on pin 15 (StD) remains constant as soon as circuit is powered

It should glow only momentarily when powered on and then each time
new tone is fed to the circuit

What this error means ?
Click to expand...


there may be a problem in your circuit, please check again

pin StD: standby low(0) , if there dial so high(1) moment
 

It is Xtal problem. Where to get reliable 3.58 Mhz Xtals for this project
 

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