Hey thanks for the help, the PNP transistor is sounding like a much
better idea. I run into one snag though, the PNP's I have can only
support a max of 100mA at the collector and my load is six leds at 20mA
each, so I need atleast +120mA. This is where I was heading asking
about using 2 transistors on one output to split the load. I need to
know how to calculate the resistor values need for the transistor.
Re: Help needed designing simple circuit ... Here's my idea for the circuit: http://www.geocities.com/bonezphoto/misc/One-shotBell.gif ... That insures the drive to the transistor truly goes to zero after some amount of time. ... voltage divider to yield ~20 volts for load device;... R5 should be much smaller than R4 since Vbe will always be under a volt.... (sci.electronics.repair)
Re: Transistor questions ... about using 2 transistors on one output to split the load.... know how to calculate the resistor values need for the transistor....gate and a +12V supply. ... (sci.electronics.basics)
Re: Another transistor question ... any current into the load must come through the 1k collector resistor. ... The load and the transistor in this circuit are in parallel, and divide the current that arrives through the 1k collector resistor.... (sci.electronics.basics)
Re: My first transistor circuit ... schematics and I even made a simple LED light display by hand with a do it ... current flowing through the transistor then correct? ... Figuring that R4 is my load.... I think you might do a search for and see if you can come up with a circuit that uses a 555 timer to pules the transistor fully on and off, with a variable duty cycle, sort of like dimming the lights by rapidly flipping the switch on and off. ... (sci.electronics.basics)
Re: quick emitter follower question ... I'm thinking about using a simple 1 transistor emitter follower... will there be no noise added since there is no amplification ... The smaller the load, the more the ... (sci.electronics.basics)
