Voltage Controlled Variable Gain Video Amplifier

For you those are not familiar with analog circuits, it might seem difficult to find a practical  application of analog video amplifier circuit. In today’s electronics, you might be wonder how such circuit can be useful in this digital domination era. You can see almost all of new devices provide digital interface for video, even a low cost Raspberry Pi […]

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Double-Sideband Suppressed-Carrier (DSB-SC) Modulator

When we modulate a carrier signal with amplitude modulation, there will be four frequency components as the result. The first is the modulating signal itself, the second is the frequency carrier, the the latest two are the difference and the sum of the carrier and the modulating signal.  The spectrum of these frequencies can be seen using frequency analyzer.  In […]

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LM1201 Video Amplifier with Balanced (Bi-Phase) Output

This is a schematic diagram of video amplifier circuit with bi-phase output.  Bi-phase output provides both positive-going and negative-going signal, and can be used as balanced signaling. The main component of this circuit is LM1201.  In this circuit, the inverted video is obtained at pin 10 because of the 75Ω termination to the power supply voltage. The voltage divider on […]

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AM Radio Receiver Circuit Employs FM IC Chip

This AM receiver consists of a TDA7000 single-chip FM receiver (U1) as the main radio component,  and an LM386  chip for low-voltage audio-power amplifier (U2) circuit. The receiving coils are  hand-wound coils (L1 and L2), and a few additional components.  This coils, together with the variable capacitor, is chosen to match the AM frequency. To wind your won coil, L1 […]

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