Enrique15
Member level 3
transistor drive speaker
I built a simple alarm circuit using IC555. The IC555 oscillations switch a BJT transistor, which has a speaker between the voltage source (4 batteries AA, to give 6V to the circuit) and the collector.
Even though the speaker is not turned on constantly, but just a few times in a day, after a couple of days the speaker started to have less volume. So I disconnected the batteries, and a little while after I connected them again, and the speaker started to sound loud again, but just a few times, and again the volume started to drop. So, the batteries are almost "dry", just after 2 days of using the alarm.
I talked about some problems caused (maybe) for this "battery fast voltage loose" in the last posts of a previous topic I made:
Can somebody tell me if the problem is how a connected the circuit (if batteries are supposed to handle a speakers load)?
Or if the problem is that batteries CAN'T HANDLE a speaker.
I built the circuit to give near 350 mA to the speaker, so it's sound is low but enough to hear at 2 or 3 meters.
Is that amount of current (350, maybe 400 mA) too much for 4 batteries to "keep alive" for many days ???
Thanks for any help.
See you later.
I built a simple alarm circuit using IC555. The IC555 oscillations switch a BJT transistor, which has a speaker between the voltage source (4 batteries AA, to give 6V to the circuit) and the collector.
Even though the speaker is not turned on constantly, but just a few times in a day, after a couple of days the speaker started to have less volume. So I disconnected the batteries, and a little while after I connected them again, and the speaker started to sound loud again, but just a few times, and again the volume started to drop. So, the batteries are almost "dry", just after 2 days of using the alarm.
I talked about some problems caused (maybe) for this "battery fast voltage loose" in the last posts of a previous topic I made:
Can somebody tell me if the problem is how a connected the circuit (if batteries are supposed to handle a speakers load)?
Or if the problem is that batteries CAN'T HANDLE a speaker.
I built the circuit to give near 350 mA to the speaker, so it's sound is low but enough to hear at 2 or 3 meters.
Is that amount of current (350, maybe 400 mA) too much for 4 batteries to "keep alive" for many days ???
Thanks for any help.
See you later.