This circuit can be used to test up to three LEDs at once, connected in series. You can easily increase that number by using a higher supply voltage. If you do so, you should allow 2.7 V for each ...
A blast from the Elektor archives: this 1998 battery tester uses a simple LED display to reveal a battery’s true condition ...
The simple Diode and LED Tester presented here costs under £5 to build (including all components, the battery and a cheap case) and will indicate the polarity of almost all types of LED and other ...
Results that may be inaccessible to you are currently showing.
Hide inaccessible results
Feedback