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Hi
I have a PCB of commercial digital clock, it contains a " temperature sensor with two wires" labeled on board as "RT103".
I want to use this sensor in another DIY project but I couldn't find its datasheet.
Do you have Any info. about this sensor?
No, there is nothing written on the buzzer.
By the way, I've gotten another device with good sound, then connected its buzzer to the malfunctioned device and it worked well, so the problem is definitely in the buzzer, the question now:
Is replacement the only fixation for this device? or I can...
Hi,
I have an alarm device with buzzer, it must be 65db loud, but it produces only very low sound.
I've checked the transistor and transformer driving the buzzer, and found they are good.
Is the problem definitely in the buzzer?
If yes, can it be repaired? or it must be replaced
Thanks for...
I will try to clarify the problem more.
first, I have imported dozens of this device 'SOME OF THEM' suffering from this problem, and the Far Eastern manufacturer doesn't respond to my question :-?
so it's not a convenient solution to add a wire for grounding.
second, the device shouldn't...
Hi,
I have a voice activated RF Transmitter, ~23MHz, powered from AC lines (220V 50Hz)[no ground wire].
It is always activated with noise sound in the Receiver,But it works normally while I'm touching the Ground track of PCB.
- after touching the PCB several times on several points, it...
[SOLVED]: Troubleshooting dialer alarm device
I have Repaired this device :-D
Using Try and Error replacing for IC's and Transistors, at last I replaced the transistor (Q9 = S8050 D) near the Relay.
[SOLVED]: Troubleshooting dialer alarm device
Hi,
I have an alarm dialer device (MA80) works properly except dialing.
- I tried to replace the dtmf generator (HT9200A) but it didn't work.
When the alarm is activated by body motion, the telephone line becomes in use, but when I listen to...
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