There is not a coaxial input to the motor control chassis, so I doubt that composite sync was fed to it (cables would be 5 or 6 feet long), which might rule out a sync pulse for the red field. Some other interesting things. The CRT has the pin type anode connector that DuMont used in the late 40s. That means the tube was a 12J or Q probably. There are two flybacks -
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one for horizontal sweep and one for HV. It will be interesting to see how high the HV is. The video amp uses parallel 6BG6s as ouputs. I guess they needed it to handle 18 mHz The power supply is a monster, with two regulated B+ outputs. I will be posting schematics as I get them done, starting with the video and vertical sweep chassis. Today I finished documenting the 3 chassis and everything fell into place. I am still trying to figure out what kind of horizontal oscillator transformer was in the set. It plugged into an octal socket and I think it was wired like this. I think there were 3 windings on it, and since it will be difficult to find a 3 winding transformer, I will try and modified circut, also shown on that link. That schematic is very similar to the oscillator used in the HV section of the DuMont Royal Sovereign, which was from the same year as this monitor. I have replaced all the paper and electrolytic capacitors. Everything seems to work - HV is 15 KV. I used a standard horizontal blocking oscillator transformer, and it worked fine at 46 kHz. Since I don`t have a signal source yet I`m not sure how the sync will work. Cliff Benham has the wheel, and is building a replica. He has also volunteered to build a motor control circuit, which will be locked to the power line. Here is the schematic of the CBS slave receiver motor control, which he intends to duplicate: I looked at how the motor control would work if...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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