Auto Tachometer

Here is the circuit diagram for a Simple Auto Tachometer which can be used for any vechile. I tested this in my car and it works fine. My next plan is to replace the analoge meter with seven segment display unit. I'll upload it once I done. Please let me know if you find any technical issue with this circuit.

Find Solenoids

Vast requests about the 12V solenoids. Most of them have mentioned that they cannot find solenoids which are fitting for door security system. You can upload the blog regarding any problems occur with this. I’ll reply within two days time.

These solenoids are mostly available in motor spare part shops.

Home Security - Implement Code Lock to a Home Door

The previous circuit (Digital Code Lock) can be easily applied to a home door or a window by using a solenoid.

For that you require 12 volts / 2 pin solenoid. Simply connect the two terminals of the solenoid to the A and B terminals of the circuit.

If you really interested, you can implement so many useful applications by using this circuit.