buzzer circuits
buzzer circuits
(OP)
I tried to fix a buzzer circuit with reset capabilities to a machine or
handler. The buzzer circuit system well is activated when there is an
error message in the machine and the user able to reset the alarm.
Currently, I tried to tap the signal or supply for the circuit from the
tower light. When there is an error message the red light well is
activated so, I connected the circuit in parallel with the red light
supply.
Whereby, the supply will be 24v when red light is activated. FYI, the
light is triggered by ground signal not by supply.
Aboveentioned buzzer circuit compromise of following circuit
1. Since the circuit works with 12v so we used a regulator circuit.
2. Followed by 555 press to turn off circuit.
3. buzzer was connected at the output of the circuit
12v regulator cct-----555 IC Press ---------buzzer
off circuit(reset)
However, when I connected it cause the controller board in the computer
malfunction or
handler. The buzzer circuit system well is activated when there is an
error message in the machine and the user able to reset the alarm.
Currently, I tried to tap the signal or supply for the circuit from the
tower light. When there is an error message the red light well is
activated so, I connected the circuit in parallel with the red light
supply.
Whereby, the supply will be 24v when red light is activated. FYI, the
light is triggered by ground signal not by supply.
Aboveentioned buzzer circuit compromise of following circuit
1. Since the circuit works with 12v so we used a regulator circuit.
2. Followed by 555 press to turn off circuit.
3. buzzer was connected at the output of the circuit
12v regulator cct-----555 IC Press ---------buzzer
off circuit(reset)
However, when I connected it cause the controller board in the computer
malfunction or





RE: buzzer circuits
The output as you said that connected to a buzzer. Unfortunately I can't read your complete letter. Anyway in my experience; replace the buzzer with a small 12VDC relay (if your final driver strong enough to drive both buzzer & relay connect it together -in paralel). Then the relay contacts could be wired in series with the light bulb into your 24VDC supply. The relay will interface the light bulb to the main 555's circuit.
Good luck!
RE: buzzer circuits
555 timers can produce large pulse demands on the supply during output transition.
The relay idea is good. It buffers the controller output.
Don't forget to suppress the relay coil. The controller may not have that capability.
Let me know.