Whooper


Posted on Jan 12, 2013

Integrated circuit Ul is connected as a low-frequency asymmetrical oscillator. Its output is inverted by Ql and fed to the reset te


Whooper
Click here to download the full size of the above Circuit.

rminal of U2 at pin 5. Integrated circuit U2 is configured as an audio oscillator and is enabled when the output of Ul is low. With the voltage at pin 5 of U2 constant, the circuit just" "bleeps."" The voltage across capacitor CI is fed to the base of Q2, which turns it on and grounds pin 5 of U2. When the frequency of the reset signal on pin 4 falls, the output frequency of U2 rises. The output then becomes a whoop, starting low in frequency and ending high. Resistor Rl sets the repetition rate and R2 determines the time duration of the whoop. Resistors R3 and R4 set the center-operating frequency.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Bridging Adapter For Power Amplifiers
4W FM Transmitter with 2N2219
Adc
petrol gas switch for pajero
NiCd Simple Smart Nicad Battery Charger circuit
Mains operated LED night lamp
Motionless Electromagnetic Generator (MEG) Free energy
Electric oven circuit
BBE monolithic integrated circuit M2150A



Top