video amplifier for B/W television sets

10141.41 video amplifier for B/W television sets It appears that the use of portable, mains operated television receivers as monitor in a computer system has become very popular. The article use your TV receiver as a monitor (Elektor, November 1984) described an all- embracing amplifier, but here we pro- pose a much simpler one. To raise the standard video signal of 1 Vppto the level required by the tele- vision receiver, a preamplifier with a bandwidth of not less than 10 MHz is required. With careful construction of the present amplifier, this bandwidth is guaranteed, and should actually be of the order of close to 20 MHz. With a supply voltage of 12 V, the direct- voltage output is 4 V. If different supply voltages are used, the DC out- put is retained at that level by suitably altering the values of R, and R2 (which form a voltage divider). How- ever, the supply voltage should not be lower than 10 V, nor higher than 15 V. The amplification depends on the ratio 87: R8; if highe...