When you measure the output of the circuit to be 6v, do you have the output connected to anything other than a meter or an oscilloscope?3dchipmaker said:Thanks For Your Reply.
The Problem Is That When Assembled The Out Put Is 6v I Would Like It To Be As Close To 12v As Possible And Still Maintain Pulse Rate.
If you are using the standard bipolar 555, its output is fed from the 12v rail via two NPN transistors connected as a Darlington pair. That, together with your external transistor, gives 3 x 0.7v drops from the rail. So your output cannot exceed 9.9V even with a high value resistive load.3dchipmaker said:attached is schematic
I think you need to connect pin 7 of your 555 to the junction of the pot and the feedback resistor R2.3dchipmaker said:thanks for your help!!
i have another schematic that puts out about what i want and has a good sharp pulse.i need to tune the pulse rate. it is in the ballpark but i want 30 pulses per second. can i attach a pot to this circuit to control pulserate and if so where?
The original circuit shown for the 555 will work OK. It does not need the discharge pin connected. It is an astable oscillator with a unity mark-space ratio. The problem, as I said before, is that the output will not go to the +ve rail.JoeJester said:3D,
Where did you get that original schematic in your first posting? It also doesn't show pin 7 connected.
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by Jake Hertz
by Jake Hertz