The enhancer amplifies the high frequencies of a video signal, resulting in a sharper picture. It may be inserted between, say, the video recorder output and the SCART input of the television receiver.
The simple design is based on only three transistors. The first, T1, is a buffer. Resistor R1 ensures that input impedance of order of 75Ω. The signal is then applied to amplifier T2, whose gain is determined by the setting of P2.
The frequency characteristics of a signal at the base of T2 is shaped by P1, R6, and C6 and is, therefore, to a certain extent under the control of the user (by P1). Buffer T3, provides sufficient current for correctly driving most 75Ω loads. Preset P2, must be set to give an output voltage of 1 Vpp (terminated output: for an open circuit output the level should be 2 Vpp).
The enhancer draws a current of about 50mA. Note that 12V supply should be regulated.
Why Should You Use a Video Enhancer?
Video enhancers contain a variety of capabilities that can give your footage a new lease on life. Naturally, not all of these functions are available in every app, but you may expect to see some of the following:
- Upscaled resolution
- Better lighting
- Improved stability
- Brightness adjustments
- Cropping, rotating, and flipping
- Effects and animations
SCART is a French-originated standard and associated 21-pin connector for connecting audio-visual (AV) equipment. The signals carried by SCART include both composite and RGB (with composite synchronization) video, stereo audio input/output, and digital signaling. The standard was extended at the end of the 1980s to support the new S-Video signals. A TV can be woken from standby mode and automatically switch to the appropriate AV channel when the SCART attached device is switched on.