Recent content by Baluncore

Maximum tension will be at 5°. Half of the mass of each leaf rests on the ground, the other half at the top pivot, making 80 kg total at the top. Tan(5°) = 80 kg / tension kg Tension in rope; t = 80 / tan(5°) = 915 kg. Tensional force in rope = 9.8 * 915 kg = 8967. newton.

The fan lowers the pressure at the inlet. Air from all directions begins to flow toward the fan, turning gradually as it accelerates, onto the axis of the fan. Once accelerated by the fan, the air has momentum that carries it away from the fan outlet, without any need to immediately spread out...

What was the capacity of the old pump in cubic feet of free air per minute? How does that compare with the replacement? Did the original pump have an unloading valve in the head, does the replacement pump have the same? Or is the motor turning off when the set pressure is reached? Consider...

Forget my previous post. I have fixed a few bugs and got the uA709 / LM709 working as a 5kHz voltage follower. Attached are the .asc and .plt files you need to test it. You should be able to analyse the uA709 by modifying only the external circuit. Remember to remove the .txt extensions. Here...

You need to comment out the *.subckt and *.ends to make the nodes and components in the model available on that schematic page. You can then connect it to external schematic by using the internal node names. Attached is uA709.asc.txt which can be attached to a post because it is an ASCII text...

There are two ways. 1. You can simply copy the spice text into a .op spice directive box, then place that on the schematic page. 2. You can create a new filename.asy, (maybe explode and edit an older one), using the symbol editor. Place the spice text in a filename.sub circuit file with the same...

There are several reasons why extra high voltage lines are not insulated. If insulation was present on EHV lines, corona discharge could pyrolyse, or ignite, the insulation. The drag forces due to wind are typically greater than the force due to gravity. The total force on the catenary is the...

Laminar flow cabinets circulate air through filters. UV light is used to sterilise the filters, to prevent colonisation of the filters with pathogens.

The path length for a flat braid? The golden braid.

The clock designer appears to have used the sidereal month, not the synodic month, in their design calculations. Sidereal month = 27.32166 days. Sidereal year = 365.25636 days. Synodic month = 29.53059 days. (Phase of the Moon). The periods are related by: 1 / 27.32166 - 1 / 365.256 = 1 / 29.53059

Any SPICE will do with that code, but LTspice, now from ADI, is probably the best at the moment, and is free. Also, subscribe to https://groups.io/g/LTspice which is great for help with running LTspice.

Here is an LTspice model for the uA/LM709. At the end it defines the transistors used as all having the same specifications. * LM709 SPICE Model * Datasheet: http://www.national.com/ds.cgi/LM/LM709.pdf * Helmut Sennewald * * Input compensation B (8) ---------------------\ * Input compensation A...

Do you have the full circuit for the uA709, or just the simplified diagram ? Resistor values are here: https://lh.pe/file/UA709CN(1).pdf

You will require at least five dedicated ICs to implement the state machine specified in post #1. It will need to employ an up/down counter, and you would need a custom PCB. It would be much easier to program a single chip microcontroller that comes ready on a small PCB and costs less than$10...

https://cms.eirgrid.ie/sites/default/files/publications/Solar-Farm-Clearances-Report-Rev-A.PDF See table 1, on page 1. Since with 3PH, the three lines are usually mounted one above the other, the stray field will be a minimum towards the horizon, so 350 ft away might well be OK. A conductive...