model police car siren circuit
#siren
#police car
#sound generator
#oscillator
#speaker
#alarm
#tone generator
#electronic siren
#noise maker
#sound effect
No description available.
Super-sound-generator
Six preset controls and seven selector switches enable a vast range of different sounds to be produced and altered at will. Such sounds as steam trains chuffing, helicopters flying, bird chirping, and machine guns firing are possible, as well as...
enhanced shed garage alarm
This is an improved version of the basic Garage/Shed Alarm. The Entry and Exit delays have been extended to approximately 30 seconds, and a timed siren cut-off along with an automatic reset feature has been incorporated. Additionally, the LED indicator...
Minimal metal detector
This circuit is an oscillator with LI being a 4-inch diameter coil consisting of 35 turns of #26 magnet wire. Metal in proximity to LI will cause the oscillator to shift frequency. An AM transistor radio is used to detect...
speaker to microphone circuit converter
This circuit diagram illustrates the conversion of a speaker into a microphone. When sound waves impact the diaphragm of a speaker, fluctuations occur in the coil, generating an induced voltage. This induced voltage is typically substantial but low in output....
POLICE SIREN USES FLASHER
A low-drain circuit powered by a 1.5-V cell utilizes National LM3909 flasher integrated circuits (ICs) to replicate the "whooper" sounds characteristic of electronic sirens found in some city police cars and ambulances. Two flashers are necessary to create the required...
Personal Alarm
This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag...
Local Oscillator For Double Balanced Mixers Circuit
This circuit includes an amplifier designed to deliver +10 dBm to an SBL series (Mini-Circuits) or a similar type of doubly-balanced mixer assembly. The circuit parameters are specified for 80 to 90 MHz crystals, although the values of the oscillator...
VHF/UHF TV Modulator
A simple oscillator generates a frequency in the VHF or UHF range. This oscillator is modulated with a video signal, and the resulting modulated carrier wave is transmitted to the TV set's aerial input through a cable. The final step...
Electronic Drum Synthesizer
The circuit consists of two twin-T oscillators set below the oscillation threshold. To initiate oscillation, a touch on the Touch Pad is required. The schematic diagram illustrates the circuit, where different touch patterns on the pads can create a variety...