Search found 3 matches

by happy
Wed Sep 10, 2003 10:43 pm
Forum: General Discussion
Topic: Clock Chip
Replies: 3
Views: 2196

Re: Clock Chip

Not quite sure what you are planning to do, but here is a non-DIP type chip. TI makes the MSP430 series of chips and have app notes for self calibration and temp compensation. They will run the clock program (800 nA) for over 20 years on a coin lithium battery and cost from 99 cents. For a couple do...
by happy
Wed Sep 10, 2003 10:24 pm
Forum: General Discussion
Topic: Question about LED project
Replies: 6
Views: 1832

Re: Question about LED project

There are all kinds of white LED drivers available. The simplest was a BEAM robotics single transistor circuit. If you hook the LED's in series you will have higher efficiency than in parallel. Do a Google search for WHITE LED BATTERY TRANSISTOR. The EDN article is informative or hit "I'm feeling lu...
by happy
Wed Sep 10, 2003 10:06 pm
Forum: Robotics
Topic: Servo Control Voltage
Replies: 3
Views: 2539

Re: Servo Control Voltage

Suggest you use a 1N914 diode in series with the control line. Cathode pointing to the higher voltage device(servo). Weak pullup to the 6V between the diode and the servo. Drive the PWM like an open-collector/open-drain.<p>Ooops. Just checked my diodes are not 1N914, as they don't work. Somehow I ha...