![]() ![]() Work around this board with great care.ģ,000 volt external power supply for the post deflection anode - 20141212 Steps 12 volts up to +800 to +1200 volts at several milliamps. Last photo: 1,200 Volt High Voltage Power Supply. A generous array of potenetiometers allows for very flexible set up so that it can support the greatest number of CRTs. Then the board provides all of the DC levels and other appropriate driving voltage to the CRT. ![]() They are 6.3 V for the tube heater, +12VDC for low voltage circuits, +60VDC for the video amplifier and up to +1,200VDC for CRT second anode and deflection plate driver amplifiers. Second photo: Deflection and Video Driver Board, PCB2. Converts +12 volts to +60 volts for the CRT cathode driving video amplifier. Horizontal, vertical and video drive are known as X, Y and Z signals when discussing graphic or oscilloscope displays.Įric's CRT driver board set: 60 Volt Bias, Deflection & Video, and 1,200V Power Supply - Update 20141221įirst photo: 60 Volt Bias Board, PCB3. It also creates two scanning ramp voltages, in sync with the video, for horizontal and vertical scanning. The Tiny TV Mark 2, PCB1, provides buffered, gamma corrected, video to Eric's CRT driver boards. The function of Eric's boards is to convert low voltage drive from Tiny TV to the extremely high voltages required by these cathode ray tubes. The deflection plates, and other elements within the tube, operate at and require very high driving voltages. When one plate is driven more positive than the other, the beam will be attracted to the more postively charged plate and repelled by the negative plate. If both plates are at zero volts, the beam passes between them uneffected. The electron beam is passed between two parallel metal plates that are charged to a particular voltage. The main distinction of this project is that the tube uses electrostatic deflection. Tiny TV Mark 2 and Eric's 3 boards driving a 3JP7 radar display tube - 20141212 Adding a scope clock board kit is in the plans as well! So, let's go! They have been awaiting the arrival of the fully debugged Tiny TV board. I had assembled his CRT driver boards several months ago. We will accomplish this using a three board CRT driver circuit designed by my friend Eric Schlaepfer. PROJECT GOAL: Display television pictures on a small oscilloscope or radar display tube with my Tiny TV Mark 2 video rasterizer board. LabGuy's World: Electrostatic Cathode Ray Tube Project 1 LabGuy's World: Electrostatic Cathode Ray Tube Project 1 ![]()
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