USB sound card

Description. Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Tex...

Digital Volume Control

This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1 controls t...

Scoring game circuit

Description. A simple scoring game circuit that can be used for all occasions when a dice is needed.The circuit is based on a NE555 time...

Digital code lock

Description. This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual fl...

Combination Lock

D-type bistables can easily be used to make a combination lock . Using two 4013 integrated circuits, you can make a 4-digit combination loc...

Combination Lock Circuit

Combination Lock circuit This circuit is very basic to build. To open a the lock which is connected to the K1 Load. you must press each mom...

Contactless Mains Voltage Indicator

This is a CMOS IC (CD4033) based circuit which can be used to detect presence of mains AC voltage without any electrical contact with the c...