Free electronic circuit design and schematic diagram
For RF (radio frequency) transmitter experiment, watt meter is useful for optimizing the transmitter circuit. A simple RF watt meter circuit is shown in the schematic diagram below. Because circuit is not frequency sensitive, calibration is accurate on all HF bands. The sensitivity is affected by meter movement, number of turns in primary coil, and resistive voltage driver. Pots can […]
Read moreThis is a circuit breakers video. This video explains about circuit breakers. Circuit breakers is a electronics device that is designed to provide convenience and protection. A circuit breaker can be easily and quickly reset after it trips and the circuit fault is corrected. If a fuse blows a replacement fuse may not readily available. A breaker help to maintain […]
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When operating from 12.5 V auto battery, single TRW PT5757 transistor provides 10 W output. L1 is 4 tums No. 20 enamel and L2 is 10 tums No.20. Both, L1 and L2 has 3/32inch inner diameter. T1 is 4:1 transmission-line transformer made from 3-inch length of twisted-pair No. 20 enamel. This circuit can be used to amplify small transmitter (1W), […]
Read moreBelow is video tutorial about Op Amp primer. Onthis following video tell us about how an Op Amp primer works. The operation of an Op Amp is very simple, just comparing 2 voltages . There are 2 inputs on Op Amp, positive input and negative input. The positive input is called as non-inverting input and the negative input is called […]
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Any frequency below 100kHz will be converted into an output voltage by TC9400 frequency-to-voltage converter. The TC9400 is linear to the input frequency. The equivalent frequency will be displayed on an analog meter. Here is the block diagram of the system: A frequency divider in front of the TC9400 can be used to scale the frequency down into the 100kHz […]
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This is a Low Distortion Crystal Oscillator circuit. This circuit generate a sinewave that has low phase noise and distortion. This circuit can be used to perform a crystal with less than 1mV dissipated in crystal. The crystal is used to filter the signal current. If the impedance loads is low, the JFET will drive the impedance. when the loads […]
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If we want to record very low frequency or DC signal on an audio recording system, we have to convert the DC/low frequency signal into the spectrum of audible sound. The figure of DC response data recording system is shown below. We can record low-frequency analog data (DC to 10kHz) anywhere, store, and then reproduced. The frequency spectrum of the […]
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