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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 ?
 

Li_ereunpisan

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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 ?

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

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

heena17

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

Golden Electronics

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U can purchase it from Element14 ..........Crystal Make KDS, FOX etc............
 

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