Tuesday, October 28, 2014
TA8122 bassed AM FM radio receiver Diagram
A very simple low power AM FM radio receiver electronic projects can be designed using the TA8122 integrated AM FM receiver , manufactured by Toshiba Semiconductor . This radio receiver circuit can be used for portable radio applications or other similar devices .
TA8122 radio receiver circuit supports a wide input voltage range from 1.7 volt up to 7 volts , but for this AM FM radio receiver circuit we will need just a 3 volt DC input voltage ( you can use two 1.5 volt Batteries ) .
Using this receiver integrated circuit you can design a very simple AM FM radio receiver or a radio receiver circuit that supports just one of this band (AM or FM) using few additional components .
Sunday, October 26, 2014
4017 bassed Ultrasonic Parking Sonar Diagram Circuit
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.
Wednesday, October 8, 2014
NCP3155 bassed 5 volt regulator circuit project with explanation
This 5 volt regulator circuit project is designed using the NCP3155 DC DC synchronous switching regulator with fully integrated power switches and full fault protection. The switching frequency of 1 MHz and 500 kHz allows the use of small filter components, which results in smaller board space and reduced BOM cost.
This 5 volt regulator circuit project drives high−side and low−side N−channel power MOSFETs. The NCP3155 incorporates an internal boost circuit consisting of a boost clamp and boost diode to provide supply voltage for the high side MOSFET gate driver. This regulator also integrates several protection features including input undervoltage lockout (UVLO), output undervoltage (OUV), output overvoltage (OOV), adjustable high−side
current limit (ISET and ILIM), and thermal shutdown (TSD).
This circuit require few external electronic parts and can be configured very easy . In put voltage that is required by this power supply circuit must be between 10.8 and 24 volts an can provide a fixed output voltage between 1.2 volts up to 5 volts by changing a simple resistor .
