NC , NC X photo above: Note the relocated pilot lamp and the hole plugs covering the unused crystal filter control holes when compared to the NC X header photo. History of the Design and Production – Many radio engineers of the thirties believed that the absolute, best sensitivity and stability of a communication receiver’s RF amplifier, First Detector and Local Oscillator could only be achieved by using “plug-in” coils. This type of approach eliminated problems of lead length, shielding and stability along with isolation of unused tuned circuits – problems that were commonly found in broadcast receivers using conventional rotary bandswitches. Plug-in coils were a hassle, no doubt. James Millen, National Co. But, how to effectively eliminate the valid arguments against plug-in coil use in a new product?
Can a transformer be back-fed or used in reverse?
Cuts styrofoam for surfboards, model plane wings, sculpture, model train or tabletop wargame terrain, 3D sign letters, mold models for lost foam casting, etc. Please be sure to read the comments that other users have left below. There’s a LOT of good info there. Check out the links that folks have posted and study what they’ve said here and you will be able to build a cutter thats suited to your budget and the materials you have access to.
There are a lot of alternatives listed or linked below for the frame, the transformer, the wire, the enclosure, and the heat control. Don’t underestimate the power of comments!
Feb 23, · Be advised that when you wire a transformer “backwards”, the inrush will be great, and the style of circuit breaker should be selected with care, or use fuses. One reason not to give DIY advice: Catch a man a fish and you can sell it to him.
Tube Stuff Suppliers Appendix B. Tube amps have always been the amplifier of choice for the working musician. Musical myth has ascribed almost magical tone to them. While the results may not be entirely magic, tubes do have a sound that is different from solid state amplifiers, and one that happens to make amplified music sound better to the human ears and brain.
There are lots of technical and psuedo-technical explanations for why this should be true, but there is enough solid evidence that it is a real effect to trust it. The real reason to use tube amps is simply that they sound better. For that advantage, we put up with the poor supply of parts, high prices, fragility and excess heat that they produce.
Are Tube Amps louder than solid state amps of the same power? Some excellent scientific work on tube preamplifiers and their distortion products has turned up the mechanism for this.
Need Help w/ Nightscaping Transformer & Timer
From a question on the Vintage Guitar Bulletin Board: Can you connect a transformer backwards? What I’m asking is, can you use the secondary as a rimary and vice versa? I always hear that you can test: Does is work under:
Oct 26, · Wiring a transformer backwards? I am building a design in which I need only a little bit of V or so and a lot of 12V. Is it safe/legitimate to hook up a conventional power transformer backwards, of the right turns ratio to give me the voltage that I want? (12V -> V, say?) Or will.
How To Connect Current Transformers? The primary of a current transformer typically has only one turn. In most cases, the primary of a current transformer is a single wire or busbar ,and the secondary is wound on a laminated magnetic core, placed around the conductor in which the current needs to be measured, as illustrated in figure 1. If primary current exists and the secondary circuit of a CT is closed, the winding builds and maintains a counter or back EMF to the primary magnetizing force.
Should the secondary be opened with current in the primary, the counter EMF is removed; and the primary magnetizing force builds up an extremely high voltage in the secondary, which is dangerous to personnel and can destroy the current transformer. For this reason, the secondary of a current transformer should always be shorted before removing a relay from its case or removing any other device that the CT operates. This protects the CT from overvoltage.
Current transformers are used with ammeters, wattmeters, powerfactor meters, watt-hour meters, compensators, protective and regulating relays, and trip coils of circuit breakers. One CT can be used to operate several instruments, provided the combined loads of the instruments do not exceed that for which the CT is rated. Secondary windings are usually rated at 5 amperes. A variety of current transformers are shown in figure 2. Many times, CTs have several taps on the secondary winding to adjust the range of current possible to measure on the primary.
Can I connect a transformer backwards?
Increasing EM Game Performance 3a. When Thing Still Don’t Work: The Check List So you’re the impatient type, and couldn’t stand to wade through all the above information and things to do.
Apr 08, · 3-phase Transformer, Y input, delta out: Hook up neutral on the input? Page 1 of 2 1 2 Last. Jump to page: but it’s conceiveable I might want to hook one up backwards some day. In the back of my mind is a warning about grounding problems doing this but I don’t remember the specifics. much smaller step up transformer for it that you can.
Originally Posted by bubbahotep Automotive coils are not transformers, just a single coil winding. I got yelled at once suggesting that it was ‘like’ a transformer. I don’t want to reverse my coil to test it. I’ve been chasing a hard start issue for years, this adds 1 more thing to the mix. I would think that even if the spark jumps the wrong way on the plug it wouldn’t matter Fire is fire, no? I should ask my question on a site where people know less about cars because they’ll tend to make more mistakes like this.
Whom-ever told you that is wrong. An automotive coil consists of two windings a primary that’s being switched by whatever is in the distributor using from 9 to 12 volts and a secondary winding that delivers several thousand volts. Both coils are wrapped around a soft iron core. The collapse of the magnetic field generated by the primary winding when it’s switched off causes a voltage to form in the secondary coil which is connected to the spark plugs via the distributor in older systems.
The primary coil has several hundred loops of a large size wire, the secondary winding has thousands of loops of a much finer wire. In simple terms the ratio between the windings establishes the difference between the voltages of input to output. It’s actually stickier than that but the point I’m trying to get to is that an ignition coil most certainly satisfies the definition of a transformer.
Wiring a transformer backwards?
The tropes related to these spinoffs can be found here and here. Also of note is Courier’s Mind: Rise of New Vegas , which gained a degree of notoriety for its sheer length – 80 episodes and running, divided into episode “seasons. After running from to , the final HL1 episode was released on December 31st,
Can you hook up a transformer backwards. Published: The design is for the current to flow in 1 direction and for the circuit break to be on the negative side of the coil.
Tue Jul 10, In the Example of a fuel cell circuit of FIG. The core is 1. A primary coil of turns of 24 gauge copper wire is provided and coil of turns of 36 gauge wire comprises the secondary winding. In the circuit of FIG 1, the diode is a 1N diode which acts as a blocking diode and an electric switch that allows voltage flow in one direction only. Thus, the capacitor is never subjected to a pulse of reverse polarity.
A Cellar Full of Screams
More or less, yes. The basic principle is entirely reversible. What you can’t do is go mad with it.
Oct 19, · I have used a 3KVA “backwards” rig for almost nine years without issue. For four speed 1 1/2 HP V motor on the 3B jig bore. For this size of transformer the primary is designed for a few %* more power then then the secondary, so operating “backwards”, you should underate the load by a .
Even uncharged wires are full of charge! After all, the atoms of the metal are made half of positive protons and half of negative electrons. Metals are special because their electrons don’t stay connected to the metal atoms, instead they fly around inside the metal and form a type of electric “liquid” inside the wires. All wires are full of electric fluid. Modern scientists call this the “electron sea” or “electron gas. The movable charge-stuff is not invisible, it actually gives metals their silvery shine.
The electron gas is like a silvery fluid. When a circle of wire surrounds a magnetic field, and the magnetic field then changes, a circular “pressure” called Voltage appears. The faster the magnetic field changes, the larger the voltage becomes. This circular voltage trys to force the movable charges in the wire to rotate around the circle. In other words, moving magnets cause changing magnetic fields which try to create electric currents in closed circles of wire.
A moving magnet causes a pumping action along the wire.
Building a Stereo Tube Amp
Can a transformer be back-fed or used in reverse? The need to back-feed a transformer typically results from a combination of factors including: Typically the step-up transformers are not stocked. Ordering a proper step-up transformer specifically designed for the application might be more expensive than trying to use a standard step-down distribution transformer in reverse feed.
A proper step-up transformer depending on its complexity is typically built-to-order with a delivery in the weeks timeframe from most manufacturers. The reason is that reverse feeding such transformers may result in technical issues and safety aspects that could be easily avoided by using a transformer specifically designed for the required step-up application.
Sep 27, · Wiring a Transformer backwards. I have/ at my Jobsite. I need / to supply a temp material hoist. My shop has a step down primary to secondary transformer. But I am just set on thinking if you hook up a wye system and something happens to it, the only path is phase to phase. MAybe I should not have said to bond xo, but to.
They don’t necessarily have the same wire gauge. So the resistance grows very roughly by the square of N. Not necessarily, but if it’s a step-down transformer, the primary will probably have a higher gauge thinner wire than the secondary if the wire is going to be different. In a step-down, the secondary has a higher current than the primary.
Yes, the phase will matter. If there really aren’t any diagrams and you have two identical 12V secondaries, then you could hook them up “backwards” which would give you 0V in series. If you want to use them in series, connect the two windings in series and measure the AC voltage from end to end. If it’s 24V, good! Otherwise, swap the wires of one of the secondaries. For the secondaries I presume they’re separated.
To find start and end of a winding you measure resistance with your multimeter. Depending on the transformer’s rating you’ll measure a few hundred ohms between begin and end of a winding.