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Long Range (10m) IR Beam Break Detector
Written by admin   
Thursday, 28 July 2011 00:00

Authors: admin


This project is an IR beam break detector that has a range of 10m. After publishing IR Short Distance Beam Cut Detector Giorgos Lazaridis received requests for a version that will have extended range so he build the circuit on the link below. The transmitter is based on 556 timer IC that has two 555 timers inside and an high power IR led. The receiver is based on TSOP1838 IR receiver chip, a 555 timer IC and a 4017 decade counter. Check schematics and construction details on the link below.

Long Range (10m) IR Beam Break Detector –[Link]

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Last Updated on Thursday, 28 July 2011 01:25
 
Solid State Relay
Written by admin   
Tuesday, 14 June 2011 00:00

Authors: admin


electronics-diy.com writes:

Solid State Relays are available almost everywhere these days, however they remain very expensive. Therefore, your efforts to build one yourself pays off. Especially since it only needs a handful components and the circuitry is simple and straightforward. A Solid State Relay is actually not a relay at all. There is no ‘relay’ present, just the electronics which does the switching. It works the same way as a relay; you can use a low voltage to switch a higher voltage or better.

Solid State Relay –[Link]

Last Updated on Tuesday, 14 June 2011 22:21
 
FM Radio Using TDA7000 and LM386
Written by admin   
Friday, 27 May 2011 00:00

Authors: admin


This project is a FM Radio basd on TDA7000 and LM386 integrated circuits. Schematic and PCB are available on the link below.

FM Radio Using TDA7000 and LM386 –[Link]

Last Updated on Friday, 27 May 2011 00:54
 
Crystal Detector Radio Receiver Set
Written by Administrator   
Friday, 27 May 2011 00:00


Traditionally, in a crystal detector radio tuned circuits, a mechanical type variable capacitor is used. For those of you who would like to eliminate this mechanical component, here is a modern version of the classic detector set. This radio, as shown on Figure 1, uses a varactor diode instead of the usual mechanical rotary device. 

Crystal Detector Radio Receiver Set - [via]

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Last Updated on Friday, 27 May 2011 02:02
 
Network Cable Tester
Written by Administrator   
Friday, 13 May 2011 00:00


tehnikservice.net writes:

The following construction allows a simple cable tester to determine whether the cable network is present in high-frequency signal from the source. It is a contactless version of the tester to detect the presence of a signal at distances up to 2m. It can be used to control all types of signal cables, such as divorce Ethernet,modem connections, digital TV, etc. The circuit lights an LED at the moment it accepts RF energy around the cable.

Network Cable Tester –[Link]

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Last Updated on Friday, 13 May 2011 00:49
 
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