Tuesday, August 13, 2013
Latest British Police Car Siren circuit Schematic With explanation
This is the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to generate sound frequency.
How the circuit work:
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency to alternate between 440Hz and 550Hz at a 1 Hz cyclic rate. The transistor 2N3055 is used to amplify the sound signal to the loudspeaker. This circuit should be nice for newbie hobbysts.
Tags: british police siren, electronic siren, police car siren, police siren, police siren circuit diagram,
Wednesday, June 12, 2013
UM3561 based 4 sound effect generator circuit schematic with explanation
This is a really simple sound effect generator based single sound generator chip UM3561. The UM3561 will generate four kinds of sound effects. The basic operation is that the UM3561 will generate the sound signal, then the signal delivered to 2N3706 (as speaker driver) to be amplified so you can hear the sound from a speaker.
Each switch position will generate the follofing sound effect:
- position 1 –> Police Siren
- position 2 –> Fire Engine Siren
- position 3 –> Ambulance Siren
- position 4 –> Machine Gun
Download the UM3561 datasheet for sound effect generator circuit reference:
» Download Link
Car Horn circuit schematic with explanation
The following diagram is the schematic diagram fo Car Horn, you may try this circuit for your car modification…
Components List:
| R1 = 68K R2 = 2K2 R3 = 56K R4 = 3K3 R5,R6 = 4K7 R7 = 10K Pot/trimpot | C1,C2 = 22nF C3,C5 = 100nF C4 = 1nF C6 = 220µF/25V IC1,IC2 = 7555 or TS555CN CMOS Timer ICs IC3 = TDA7052 SPKR = 8 Ohm |
Car Horn Circuit Description:
This car horn circuit reproduces the sound of contemporary vehicle horns. It had been mainly created for models and toys but, applying a high output energy audio amplifier IC, it could be implemented as well in further complicated projects.
Circuit operation
To receive a realistic automobile horn sound, two different tones mixed collectively are essential and the interval they’ll type ought to be a so known as minor third (in musical terms). This can be implemented by two 7555 CMos Timer ICs wired as astable multivibrators and generating a square wave of about 440Hz and 523Hz respectively. These frequencies ought to be quite precise, so the uncommon values necessary for your timing resistors are obtained by wiring two common worth resistors in series.
The square wave frequencies produced by IC1 (440Hz) and IC2 (523Hz) are mixed via R5 and R6 and shaped by C3, C4 and R7 in order to obtain a far more realistic tone. The resulting composite audio signal is ultimately sent for the audio power amplifier IC3 which, in turn, drives the loudspeaker. R7 needs to be adjusted to acquire a satisfactory output level.
Car Horn Circuit Notes:
- The loudspeaker may be of any form and diameter. Certainly it need to withstand a energy of at the least 1 Watt if the TDA7052 Audio power amplifier IC is chosen.
- The TDA7052 IC was used since it permits a minimum parts count and very excellent functionality. Wanting to make use of a distinct audio power amplifier IC, you are able to pick the much less effective but straightforward to find LM386 (see the Cuckoo-song Generator project).
- In any case, try a great sized device, as a way to receive finest outcomes.
- Needing a a lot more effective amplifier chip, it is possible to use the TDA2003 10W Car Radio Audio Amplifier IC or the TDA1516BQ 24W BTL Vehicle Radio Power Amplifier IC .
Source: RedCircuits