CD40106 | Electronic Project Circuits

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Coil-less FM Transmitter by IC 40106

The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.Since these inverters are in parallel the output impedance will be low so that it can directly drive an aerial of 1/4th wavelength. Since the output of N4-N6 is square wave there will be a lot of harmonics in it.
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The 9th harmonics of 10.7Mhz (96.3Mhz) will hence be at the center of the FM band. N1 is working as an audio amplifier. The audio signals from the microphone are amplified and fed to the varycap diode. The signal varies the capacitance of the varycap and hence varies the oscillator frequency which produce Frequency Modulation.

Be the first to comment - What do you think? Posted by admin - October 24, 2007 at 11:54 pm

Categories: FM transmitter, RF-Radio Frequency Tags: CD40106, FM transmitter, fm transmitter ic

Ultrasonic Parking Sonar by 40106

Feautures:

* automatic switch on on rear gear
* led-bargraph display
* audible bleep on last led
* “good old” design style, no microcontrollers!

This was one of my first designs: it is an ultrasonic parking sonar.
Based on an ultrasonic amplifier from an article seen on a 1982 magazine, it was once installed on the rear bumper of my Volvo Station Wagon. It served very well for many years. Connecting it to the reverse gear lights, it switches on automatically and shows you the distance to the nearest obstacle (according to his beam) on a led scale. When the last led lights, a buzzer is also activated telling you to stop immediately.sonar.jpg (2787 byte)

It works on the sonar principle, sending an ultrasound burst and listening for first echo. The burst generated by the oscillator built around U4D (you must set the frequency using TR2 to have 40 kHz or the maximum sensitivity), U4E buffers the output and U4F boost the signal doubling the voltage span across the TX piezo transducer .

A new burst is generated each time the decade counter (4017 in the circuit diagram) is in its reset state, that is output 0 is selected. The other outputs (1 to 9) are scanned sequentially following burst generation, until an echo strikes back the RX receiver. It is then amplified by the transistor input stage, triggering the monostable built around U4A – U4B. The monostable stops temporarly the scanning, and a led corresponding to the obstacle distance appears as continuously lit. The buzzer bleeps when the first led (minimum distance) il lit.

Read More Source: http://www.uashem.com/pageid-419.html

Be the first to comment - What do you think? Posted by admin - October 5, 2007 at 7:16 am

Categories: Audio diagram, Automotive Tags: CD40106, parking sensor, Ultrasonic Parking

DC/DC Converter DC12V to 24V 2A by IC 40106 and Mosfet BUZ11

This is Circuit DC to DC Converter.
For input DC12V-24V 4A to Output 24V-48V 2A (inputX2) Use easy circuit simple part IC Digital Cmos : 40106 and Mosfet BUZ1.

If you have power supply source about 12V, from battery 4A sizes. But want to enhance voltage be 24V or about 2 times. This circuit has can to help you by it has prominent easy good point. It use the integrated circuit digital number CD4093 perform produce the frequency drive current change CD40106 bilateral the group trips work. By drive high current with power mosfet BUZ11 make output current collect at capacitors the very total up voltage bilateral the group then is double of Input power supply. or It can enhance voltage double , be 2 times there.
Detail to See Circuit.
Source: CEW circuit Electronics Book