Free electronic circuit design and schematic diagram
This circuit diagram shows us about simple SWR which is built using readily available parts. Take a note that to ensure accurate power reading, no attempt has been made . If we want a circuit that would fit in a small enclosure, and give an indication of minimum SWR, this circuit does the trick. The trick is based on the […]
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This is a circuit of Wideband SWR Meter. This circuit is used as a test instrument. To use this circuit, connect the meter, take the necessary readings, then disconnect. The meter should not be left in the line permanently because it draws up 3/4 of the transmitted power, and a similar part of a received signal. This circuit uses Three […]
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The AGC is used in many system especially communications. This AGC works at 50Mhz, and the output voltage is set by a digital signal that is needed by Self-calibrating systems such as automatic test equipment which requires the high frequency response. During calibration, the AGC output voltage will be calculated by test equipment to get accuracy requirements. The AGC output […]
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Variable-gain amplifiers (VGAs) can be used in may types of systems, such as radio receivers. In this system, the input signal voltage depends on an uncontrolled variable, such as distance to the transmitter. To ensure that the input signal amplitude matches the input voltage range of key components, such as ADCs and DACs, thereby maximizing the converter’s dynamic range, VGA […]
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Two octave wideband amplifier (covering both the civil and military airbands between 100 and 450 MHz), equipped with two MOSFET devices, which is capable of generating 250 W of output power are given on this design procedures and measurement results report. One of the two octave wideband amplifier has to use the device s with the output capacitance reduced to […]
Read moreThis is a circuit of Closed-Loop Automatic Power Control for RF Applications. The circuit uses a log detector (AD8318) and a VGA (ADL5330). This circuit has a high temperature stability because of the high temperature stability of the AD8318. The AD8318 also ensures the same level of temperature stability at the output of the ADL5330 VGA. The ADL5330 is converted […]
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The TDA7088T can be used in mono portable and pocket radios. This is a bipolar integrated circuit. Here’s one of the application circuit diagram: When a minimum of peripheral components (of small dimensions and low cost) is important, we can use TDA7088T. Frequency-locked -loop (FLL) system with an Intermediate Frequency (IF) of about 70 KHz is built on this circuit. […]
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