3 way circuit options to indicate if circuit is active
122180
How to add indicator on a light switch to indicate the outdoor 3-way light is on?
127278
How can I locate and repair a break in a circuit?
129553
5V to 3.3V Level shifting circuit
158346
Adding 3 way switches
71610
RC circuit as clock source
36923
Which method or component is best to regulate 42 to 3.3 V?
77856
How do I check the status of the CMOS battery?
37729
What's a simpler way to switch between power sources?
25522
Low battery level circuit - Changing "trigger" level
146019
When doing electrical work, what do I use to check wires are safe?
85397
Design Review: 3.3V Logic to 12V Logic (Uni-directional and Bi-directional)
45229
How can I detect a power outage with a microcontroller?
118410
How can I replace a 4-way mechanical switch with occupancy sensor(s)?
69492
How to create automatic dual battery changeover/switching circuit for uninterruptible power?
123900
How do I design a circuit for a bi-color led to display power?
74135
NPN circuit to switch 12v 1A DC load by 3.3v 1A DC using PIR
156010
Using a diode to ensure current flows in only one direction, without causing a voltage drop