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Circuit Diagram
Temperature switching circuit

This electronic circuit is designed to monitor temperature using a sensor manufactured by National Semiconductor LM335, which provides an output voltage of 10 mV / ° C. This voltage is compared to IC1a and IC1b two reference voltages. One of them is fixed and the other with P2 to P1. Comparator...

 Temperature switching circuit using LM335
Finger touch sensor switch

Using electronic diagram below can be made a very simple circuit that activate a relay at the touch of a sensor with finger.
Sensor contact can be made from an RCA connector or some other audio jack, which has high resistance insulation .
Inverting input (-) of IC1 is powered at half...

 Finger touch sensor switch circuit
Electronic lock circuit using 4043 IC

This electronic lock is designed to work with a keyboard with 10 switches being controlled (operated / off) using a four digit code.
Forming code keys are in the scheme S1-S4. Each is connected to a flip-flop of IC1. Connections are made such that the pressing S1 will switch to "1" SET...

 Electronic lock circuit
Low power variable voltage converter

Using this circuit diagram can be made a voltage converter that allows laps positive voltage of existing power sources, or converting a negative voltage.
New supply is electrically isolated from the source through the ferrite transformer wound on a torus G2-3FT12. Primary winding consists...

 Low power variable voltage converter
XR2240 timer circuit project

The timing circuit is built using XR2240 integrated circuit manufactured by EXAR. The circuit is intended for use in timing circuits in various applications such as TV and radio equipment for monitoring battery charge and similar photo applications. Timer can be set between 15 minutes and 24...

 XR2240 timer circuit project
Touch switch electronic circuit based on a Schmitt trigger

This touch switch electronic circuit is based on a Schmitt trigger with latching, built IC1a, IC1b and R3. IC1b's output signal comes back to IC1a input through R3, resulting in maintaining stable condition of both gates. While the circuit is at rest, the anode of D1 is at "0" and the cathode of...

 Touch switch electronic circuit Schmitt trigger