« previous next »
Pages: [1]   Go Down

Author Topic: electronic switch  (Read 2896 times)

0 Members and 1 Guest are viewing this topic.

Offline giorgikTopic starter

  • Contributor
  • Posts: 25
electronic switch
« on: July 23, 2015, 02:48:46 pm »
Hello to all.
I have a circuit of this type (see attachement circuit 1)
where I use a resistor of 12K and a photoresistor LDR. The output of the signal is taken at A and sent to the base of a TIP107 (PNP darlington transistor).
Is there a way to reverse the polarity of the power supply circuit according to an external signal that presents two voltage values so as to have, as in attachement circuit 2 ?
Logged
 

Offline PSR B1257

  • Frequent Contributor
  • **
  • Posts: 330
  • Country: de
Re: electronic switch
« Reply #1 on: July 23, 2015, 02:59:51 pm »
Quote
Is there a way to reverse the polarity of the power supply circuit according to an external signal that presents two voltage values so as to have, as in attachement circuit 2 ?
What are you looking for? This explanation is a bit lot confusing.
Logged
In theory, there is no difference between theory and practice. But, in practice, there is.
 

Offline giorgikTopic starter

  • Contributor
  • Posts: 25
Re: electronic switch
« Reply #2 on: July 23, 2015, 05:16:42 pm »
Yes. To achieve this you can use a mechanical switch (see attachment), however I would like to use an electronic switch controlled by an external signal.
« Last Edit: July 23, 2015, 05:20:34 pm by giorgik »
Logged
 

Offline PSR B1257

  • Frequent Contributor
  • **
  • Posts: 330
  • Country: de
Re: electronic switch
« Reply #3 on: July 23, 2015, 06:00:07 pm »
Quote
an electronic switch controlled by an external signal.
Thats what relays are made for. Or you can use a electronic switch (according to the topic  ;) ) like a CD4066
« Last Edit: July 23, 2015, 06:07:18 pm by PSR B1257 »
Logged
In theory, there is no difference between theory and practice. But, in practice, there is.
 

Offline giorgikTopic starter

  • Contributor
  • Posts: 25
Re: electronic switch
« Reply #4 on: July 24, 2015, 09:26:28 am »
thank you PSR B1257, I will use the CD4066 that is just what I was looking for.
Logged
 
Pages: [1]   Go Up
« previous next »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 


EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee