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Connect pin directly to relay ? You wanna burn your ICs and other components.
You need to output it to proper resistor to the base of switching transistor which can take relay load
Relay coil will have protection diode in parallel. Check for polarity as it will be connected reversed.
You can...
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 ?
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