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Diode Switch Circuits
TLC555 Timer Circuit?
Im trying to create a circuit to send a pulse from a 12 volt battery about 2 times a second. What i have so far is a 555 (i have no clue how to hook this up) through a 1n4001 diode to a 12VDC relay (the pulses from the 555 will switch the relay on) through a 1n4148 diode and out to a coil. Am i missing anything?
And could you tell me what the pins are on the 555 and what i need to do to make this work?
this site tells you all you need to know about the 555
http://www.uoguelph.ca/~antoon/gadgets/555/555.html
You may need a transistor to drive the relay, the 555 can only drive small relays. Put the diode in parallel with the coil to protect the 555, not in series, and put the coil of the relay between the 555 output and 12 volts DC, the 555 can drive a more current that way.
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reed switch and neon vs transistor and diode bedini circuit aka mechanical switching
Can you confirm that what I'm saying is right (electronics engineering student)?
There is an IR transmitter circuit with an IR emmitter diode, and an IR reciever circuit, with an IR phototransistor reciever.
The IR emmiter diode has a switch in series with it.
The IR reciever circuit has a red LED in series with the reciever circuit's phototransistor reciever.
Now this is what I conclude (check this):
Since the LED lights up only when the circuit of the IR transmitter is completed by the switch, the emmiter didode will only transmit with a complete circuit and with current flowing thorugh it. This explains why when closing and opening the switch, we can see the light in the reciever circuit turn on and off.
To confirm the probability that you are right, without using direct measurement (scope, meters), you would observe the time relation between turning the switch on and off and the emission of light from the led.
To confirm the truth that you are right, you would use direct measurement.
(No offense, but it is " i before e except after c " - i.e. "receiver" )
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