Search found 319 matches

by sghioto
Sun Jan 27, 2008 12:42 pm
Forum: Robotics
Topic: Looking for a microcontroller, need suggestions.
Replies: 13
Views: 7106

I would recommend the Picaxe family of micros. Chips have built in radio and infrared xmit /receive capabilities. All programming software is free and doesn't require a compliler. Here's the link for all you need to get started.
http://www.rev-ed.co.uk/picaxe/

Steve G.
by sghioto
Sun Jan 13, 2008 2:56 pm
Forum: General Discussion
Topic: Need a simple circuit for detecting a TTL-level square wave
Replies: 7
Views: 1846

"Missing Pulse" detector circuit will work. This circuit is out of the 555 timer handbook. Circuit has been breadboarded and works with component values as shown in the schematic.

Steve G


Image
by sghioto
Mon Jan 07, 2008 5:43 pm
Forum: General Discussion
Topic: ultra low power mic preamp
Replies: 4
Views: 1202

SETEC_ Astronomy,

This circuit will work. Just need to adjust Rb value as specified for best audio quality. Not a critical adjustment.

Steve G

Image
by sghioto
Thu Jan 03, 2008 3:33 pm
Forum: General Discussion
Topic: Circuit Question
Replies: 6
Views: 1243

Steve,

This circuit will do the job. The voltage from the adaptor ( wall wart ) should be at least a volt higher than the battery for proper operation. The input pin on the 4550 will be high when running on battery power.

Image

Steve G