Five-output Video Distribution Amplifier Schematic Circuit Diagram

Enhancing Video Distribution: A Valuable Tool for Video Enthusiasts

For video enthusiasts and professionals, this compact signal distributor/amplifier proves to be an invaluable asset, especially in scenarios where distributing a single video signal among multiple pieces of equipment is necessary. The circuit featured here boasts numerous potential applications. Essentially, the distribution amplifier takes the composite video signal sourced from a video player (such as a VCR) or a video generator (with analog output) and buffers it effectively. This buffering enables the simultaneous connection of the signal to as many as five different video equipment inputs, including monitors, television sets, additional VCRs, and more.

Versatile Applications: Utilizing the Distribution Amplifier

In practical terms, consider a hall setting where the image generated by a central DVD player needs to be displayed on five separate television screens, while the audio is played through a distinct amplifier. This circuit serves as the foundation for achieving such multi-device video distribution. It relies on the EL2020 (or a similar type) operational amplifier, renowned for its generous bandwidth, making it well-suited for this purpose.

Amplifying Video Signals: The LL2020 and Output Transistor Q1

The LL2020 amplifies the input video signal with a gain adjustment range of ±6 dB. Output transistor Q1, specifically a 2N3866, is responsible for applying the amplified video signal to five outputs tailored to drive loads with a 75-Ω impedance. This configuration ensures the effective distribution of video signals to multiple devices.

Versatile Video Distribution: Ideal for Enthusiasts and Professionals

Video enthusiasts and professionals will appreciate this compact signal distributor/amplifier for its versatility. It proves invaluable when there’s a need to distribute a single video signal among various types of equipment. With the ability to buffer and distribute composite video signals from sources like a video player (VCR) or a video generator (analog output), this circuit can simultaneously feed up to five different video equipment inputs. Its wide range of applications makes it a valuable tool in the field.

Power Supply and Transistor Specifications

The circuit operates on a ±12 V symmetrical supply voltage. A configuration conveniently obtained from a standard power supply, as depicted in the schematic. The choice of the CENTRAL SEMICONDUCTOR 2N3866 and 2N3866A Silicon NPN RF Transistors is crucial. These transistors, enclosed in a hermetically sealed package, are specifically designed for high-frequency amplifier and oscillator applications, ensuring optimal performance in the circuit.

• Package Type: TO-38
• Transistor Type: NPN
• Max Collector Current(IC): 0.4A / 400mA
• Max Collector-Emitter Voltage (VCE): 30V
• Max Collector-Base Voltage (VCB): 55V
• Max Emitter-Base Voltage (VEBO): 4V
• Max Collector Dissipation (Pc): 5 Watt
• Max Transition Frequency (fT): 500 MHz
• Minimum & Maximum DC Current Gain (hFE): 10 – 200
• Max Storage & Operating temperature Should Be: -65 to +200 Centigrade