Advertisement
  • about Test & Measurement
  • Published in issue 7/2012 on page 28
About the article
LED-LDR Ring Oscillator

LED-LDR Ring Oscillator

Can high-brightness white LEDs and light-dependent resistors (LDRs) be used to make an oscillator? I decided to have a go. For the experiment I chose type PGM5516 LDRs which have a relatively low resistance (5 kOhm to 10 kOhm at 10 lux). A ring oscillator configuration was used, with each LED placed directly next to its neighbouring LDR.

Downloading of this magazine article is reserved to Elektor Members only.
Already a member? click to log in.
Products
Advertisement