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  1. Uman

    Solder station

    I am in the market for a new solder iron. I noticed some solder stations are for ESD. Is ESD important for a solder station? Please recommend a good solder station. Thanks, Jeff in Florida
  2. Uman

    PCB design and layout software

    I have a couple of questions about PCB software and manufacturers. I am in the market for a PCB design and layout application software to produce small single and double sided boards. There are so many to choose from and trial versions to "learn", I am having trouble selecting. Of course price...
  3. Uman

    Photodiode / LED Lightbar circuit - almost complete

    My class project is to build a battery operated light detector circuit using a photodiode and a LED light bar to register the light intensity. The photo diode output is connected to a single-supply 5 volt Op Amp (battery operated). The Op Amp feeds a national semi LM3914 IC light bar driver...
  4. Uman

    AA battery power rating

    I am designing a circuit that is powered by 6 AA batteries (9 volts). Due to the circuit load, there is a concerned about the power draw on the batteries. How do I calculate the the circuit continous run time until the battery voltage drops below 7 volts. The circuit will draw about 100ma...
  5. Uman

    Circuit design and simulator software

    I would like a CAD program for electronic circuit design, simulation and PCB design. I am looking at "Circuit Creator" by Advanced Microcomputer Systems (AMS) and would like any feedback on this OR other electronic design software. I would appreciate your thoughts and Recommendations...
  6. Uman

    How do I make a dc circuit auto-off after 60 minutes

    Hey Audioguru Thanks for your help and everyone else too. I ordered the CD4060 oscillator/counter chip from Fairchild semi and will try to integrate it into the circuit and make it work. Sorry about my confusion on the 4060, I ment to ask about the 2240 chip with the 555 timer you mentioned...
  7. Uman

    Gerber PCB design

    What is the most common and / or best software application to design and produce a PCB Gerber file for a simple circuit. Thanks, Jeff in Florida
  8. Uman

    How do I make a dc circuit auto-off after 60 minutes

    Hey audioguru, I am very interested your proposed circuit. What is a "4060"? I search Fairchild and could not locate the data sheet. Please help. Also, I would like the shut off circuit to reset its timer and start over, if a signal goes high from a second circuit (feed back). If no...
  9. Uman

    How do I make a dc circuit auto-off after 60 minutes

    Hey thanks for the info guys, Is there a way to design the timer circuit to restart the timer if and event occures? Will a 555 timer count throu 60 minutes? Thanks, Jeff in Florida
  10. Uman

    How do I make a dc circuit auto-off after 60 minutes

    I am designing a circuit that detects the presents of an object using an IR emiter and transistor detector. The circuit is powered by a 9v battery and sounds a buzzer when the IR light beam is interrupted. I would like to add a feature to auto OFF the circuit when no objects interupt the IR...
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