Matt circuit

This Simple Cmos Motorcycle Alarm Circuit Diagram features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike - flash the lights etc. Cmos Motorcycle Alarm Schematic Diagram Notes Any number of normally-open switches may be used. Fit "tilt" switches that close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. Once activated - the rate at which the siren switches on and off is controlled by R9 & C5. For example - increasing the value of C5 will slow it down - while reducing the value of R9 will make it faster. While at least one switch remains closed the siren will sound. About thirty seconds after all of the switches have been open...

The simple diode network can stabilize the voltage supplied to CMOS circuitry from a battery. D1 and D2 must have a c ombined forward-voltage drop of about 1.5 V. And D3 is an LED with a forward-voltage drop of about 1.7 V. The table shows the network`s output voltage as the battery`s voltage declines.   Diode Cmos Stabilizer Circuit Diagram

Build a Cmos line Receiver Circuit Diagram . This is a simple  Cmos line Receiver Circuit Diagram, in this circuit the trip point is set half way between the supplies by Rl and R2; R3 provides over 200 mV of hysteresis to increase noise immunity. Maximum frequency of operation is about 300 kHz. If response to TTL levels is desired, change R2 to 39 K. The trip point is now centered at 1 V. Cmos line Receiver Circuit Diagram