IN4148 Silicon Epitaxial Planar Switching DIODE


Posted on Feb 5, 2014

This simple diode modulator delivers excellent results when used for high percentage modulation at low signal levels. Constants are shown for a carrier frequency of about 10 MHz, but, with a suitable tank, the circuit will give good results at any frequency at which the diode approximates a good swi. A diode (IN4148) is used as a temperature senso


IN4148 Silicon Epitaxial Planar Switching DIODE
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r. IC2 is an A/D converter with BCD output. A reference voltage set by R7 is applied to the positive input of IC2. As the temperature increases, the voltage across the temperature sensor resistance decreases. This increases the differential input voltag. The circuit provides unambiguous LED + or - bar readout with steps of 0. 1%. The reference frequency is multiplied by the PLLIC1 and divider IC9 to output 64 x F (ref) and this is then gated by dividing F (measure) by 32 in IC8 thus is F (ref) -(measure) then IC2 counts 1024 pulses. Should the count. IN4148 is a silicon epitaxial planar switching diode. The reverse voltage is 75V. This circuit bellow shows a simple voltage-controlled oscillator (VCO), coupled to your instrumentation by an optoisolator, the function for measure high voltages. The optocoupler’s output is a p.




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