Recent content by Del1
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Electronic Stethoscope 2
Audio, Thanks for the quick reply. This may sound dumb but what does TR1 stand for? It looks to me to be a transistor. If it is what type and value would be correct. The use of the 555 was was give a time delay before all the sirens go off. nothing better than to let the intruder think he...- Del1
- Post #38
- Forum: General Electronics Discussion
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Electronic Stethoscope 2
AudioGuru, In your recent reply in Aaron's Forum you discussed adding another diode and a 100K resistor. Would it be possible for you to make a quick sketch of the circuit. Is this the same 100K resistor you suggested to get the bias setup for pin2 of the 555? Would it be better to add a full...- Del1
- Post #36
- Forum: General Electronics Discussion