The transmitter circuit consists of WZ-X01 RF module, Holtek HT-640 encoder and 8-bit A/D converter. U1 ADC0804 converts the analog voltage to digital data; U2 encodes that data (D0~D6) along with D6, D7 and transmitting through the RF transmitter module. The potentiometer VR1 varies the voltage to the A/D U1 pin6, since only the lower [...]
This circuit from Poptronix allows you to send video to any television in the house. It’s as educational as it is practical. Since it’s from Poptronix, a circuit board layout is included…. Related Links More circuit RF Transmitter More circuit TV Transmitter 1 Watt Universal RF Amplifier VHF Audio Video Transmitter by BF494 TV Signal [...]
The important part of the circuit is formed of the Colpitts type oscillator. C3,C4,C5,C6,CD1-CD2 and L1 determines the frequency. BF982 and dual gate MOSFET are active parts in oscillator. When the input impedance of the MOSFET gate inputs are high, LC tank is not affected. However transistors force the LC tank and cause phase shift. [...]
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