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  Topic: Ladder logic for automatic stair lights

Replies: 0
Views: 9332

PostForum: Other Hacks   Posted: Thu Feb 16, 2017 7:09 pm   Subject: Ladder logic for automatic stair lights
This program controls a strip of ten lights by two pairs of photocells at bottom and top stairs. A count signal prevents the lights from getting dark when someone is walking along the stair.
The pro ...
  Topic: Momentary latching relay

Replies: 0
Views: 7234

PostForum: Other   Posted: Thu Aug 04, 2011 4:06 pm   Subject: Momentary latching relay
This video shows a simple circuit useful to drive a monostable relay by a singol button.
  Topic: Building a seismograph

Replies: 2
Views: 18464

PostForum: Other Hacks   Posted: Fri Jul 15, 2011 1:08 pm   Subject: Building a seismograph
Mounths ago I built an [url=http://elettronicaetecnologia.blogspot.com/2011/07/earthquake-alarm-circuit-schematic.html]earthquake detector that works by an high sensitive pendulum. Not a seismograph ...
  Topic: Bidirectional shift register with 8 leds

Replies: 0
Views: 9069

PostForum: Other Hacks   Posted: Sun Jun 12, 2011 4:06 pm   Subject: Bidirectional shift register with 8 leds
This was my first circuit using digital counters. Two cd4017 drive a led strip from L1 to L8 and from L8 to L1. The counters work alternately due to the clock enable signal.
The circuit in the video ...
  Topic: 555 timer pulse width circuit

Replies: 2
Views: 12048

PostForum: New Projects Currently Being Developed   Posted: Thu Jun 02, 2011 5:45 am   Subject: 555 timer pulse width circuit
I don't know what exactly you are doing, but if you want the low period longer than the high period you can invert the signal from the output of the 555.
(instead of the pin 15) it should work.
Take ...
  Topic: A running light. How to?

Replies: 6
Views: 24612

PostForum: LED Projects   Posted: Wed Jun 01, 2011 7:02 am   Subject: A running light. How to?
Here you can find a simple project based on 4017IC
You can make it faster by using smaller capacitors.
If you are new to e ...
  Topic: Hello from Europe!

Replies: 2
Views: 10501

PostForum: Welcome   Posted: Wed Jun 01, 2011 6:47 am   Subject: Hello from Europe!
Hi every one!
My name is Andrew and I'm from Italy.
I' m an electrician (I worked in the elevators area), but I have a great passion for electronics circuits.
Due to my experience with relay logic ...
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