My dynamo isnt working. I use an adaptor giving 12V then it is connected to a 7408 IC, then connected to the dynamo. I tried everything but it wont work. I want ask or to know if is there something I need to make it work.
A dynamo is a DC generator. It does not use a 12V adapter nor an old 7408 logic IC.
An old 7408 operated from a 5V supply. It had a maximum supply of 7V and a maximum input of 5.5V.
An old 7408 IC will blow up if powered from the 12V adapter and might blow up if powered from the dynamo.
is there any other ways or methods in order for the dynamo to run. I just want a simple logic actually. If the result is 1, the dynamo runs, but if 0 it wont run.
I'm suggesting the 7408 will not provide enough current to power the motor. So use a transistor to power the motor. The IC switches the transistor on and off.
What kind of class is this? Electronics? Physics?
Have you studied transistors yet?
What voltage and current does the motor need?
Do you have a data sheet for the 7408?
The IC may be able to 'drive' the motor. I don't know.
sorry about that, i just slept in class... i just didnt heard the transistor part though
but am I correct, the output of the 7408 is connected through the base of the transistor then the +V is connected to the collector of the transistor and the dynamo is connected to the emitter of the transistor. is it correct?
You need to select a power source. I suggest 5vdc if that is enough for the motor.
You must select an npn transistor and a resistor. Ask your teacher how to do that.
Someone here can help you if required.
You want to 'saturate' the base- emitter but not burn it out. That's what the resistor is for.
The collector has to handle the current that the motor needs. A heat sink may be needed.
First step is to find out what the motor needs for voltage and current.
Edmund,
You are talking about using the NPN transistor as an emitter-follower that will have an output voltage at the emitter of only 0V to about +2.3V. Your electric motor needs 12V so use the transistor as a common-emitter type (emitter is grounded and the collector pulls one terminal of the motor to ground). The other terminal of the motor connects to +12V. Connect a rectifier diode across the motor to arrest voltage spikes produced by its inductance.
The 7408 IC needs a regulated 5V supply.