pls can anyone answer the doubts concerning the following circuit:
http://www.electronicsforu.com/elec...04-Oct04.pdf&title=Anti-Theft Alarm For Bikes
1) i know the transistor bc547 is there to provide enough current and voltage to drive IR TXR , but how do you find the exact value of current and voltage?
2) what is the use of the resistance , 390 ohm and the capacitance 100uf at pin 2 of TSOP ?
3) what exactly is the voltage value of output of RXR when you say output is high and low?i.e what voltage comes at pin 2 of lm 311
4) whats the use of the 1uf capacitor at pin 3 of TSOP?
5) and whats the real use of the comparator LM 311, cuz as far as i can see,........when RXR o/p is low, comparator o/p is low
and when RXR o/p is high, comparator o/p is high
6) also whats the design of IC 7805...i mean whats the need of the capacitors an 1 and 3 in its design
p.S- there is a small mistake in the circuit , negative input pin of 311 is no: 3 and positive one is 2 ....
pls answer quickly
http://www.electronicsforu.com/elec...04-Oct04.pdf&title=Anti-Theft Alarm For Bikes
1) i know the transistor bc547 is there to provide enough current and voltage to drive IR TXR , but how do you find the exact value of current and voltage?
2) what is the use of the resistance , 390 ohm and the capacitance 100uf at pin 2 of TSOP ?
3) what exactly is the voltage value of output of RXR when you say output is high and low?i.e what voltage comes at pin 2 of lm 311
4) whats the use of the 1uf capacitor at pin 3 of TSOP?
5) and whats the real use of the comparator LM 311, cuz as far as i can see,........when RXR o/p is low, comparator o/p is low
and when RXR o/p is high, comparator o/p is high
6) also whats the design of IC 7805...i mean whats the need of the capacitors an 1 and 3 in its design
p.S- there is a small mistake in the circuit , negative input pin of 311 is no: 3 and positive one is 2 ....
pls answer quickly