Free electronic circuit design and schematic diagram
This is a FM Transmitter circuit. This circuit uses logic gates. This transmitter circuit has a RF oscillator. This oscillator uses 10.7Mhz ceramic filter and inverter N2 to drive the parallel combination of N4 to N6 through N3. Here is the circuit: The output impedance will be low because these inverters are in parallel, so an aerial of 1/4h wavelength […]
Read more
This is pressure sensor signal conditioning circuit. It is simple and inexpensive circuit because it has small geometry and simple pressure sensor. It just uses a single Operational Amplifier. This circuit obtain power from from 3-V battery. To work properly this circuit must work in 0 C to 50 C temperature range. Here is the schematic diagram : This simple […]
Read more
To obtain an accurate pressure value, we must remove the offset errors. There are many basic circuit designs that is used to remove the offset errors. This circuit uses three method to remove the offsets errors, they are symmetrical offset trim, asymmetrical offset trim and amplifier gain adjustment. Here is the circuit: The differential sensor output must be zero V […]
Read more
This is a protocol translator circuit. This circuit uses the MAX3162, it contains both RS-485 and RS-232 transmitters and receivers. This IC contains wide range of communication devices, that can convert bidirectionally between RS-485 and RS-232 signals. Here is the circuit : The upper circuit is the translator for point to point application, and the lower is for multipoint application. […]
Read more
Ionization-based smoke detectors are efficient and cheap, so they are often installed in the house, other outbuildings, and the garage. The Locations of the device is far from house, so we need to transmit the alarm signals back into central home-security system or the house. This is a simple circuit that sense a supply current increase because activation of smoke […]
Read moreThe monostable flip flop is a electronic circuits that is used to produce a single pulse each time it is triggered. Sometimes, this circuit called a ‘one shoot’. This circuit is very useful, for example it can used to produce a delay for timing applications or debounce a mechanical switch so that only one rising and one falling edge occurs […]
Read more