CUSTOM POWER TRANSFORMER

 

 

Power transformer design considerations:

Due to limited information and misinformation available on the Internet, it would save time and money to read the accumulated explanations, presented below, given prior to building a proper working transformer for the customer.

Customer specifications or designs derived from computer programs will not work in the real world.

Steel or any metal container will increase heating and primary current due to it acting as an external shorted turn. It will not decrease the hum field only divide it up around the perimeter of the metal container. Rated primary current must be keep correct if transformer is to be in a metal container. The use of nonmetallic containers is suggested.

All power transformers will run warm to fairly hot. This is normal operation. The laminations act as shorted turns and will express a little heat. Requesting a perfectly cool running power transformer will be ignored.

The minimum diameter wire that our machine handles  is 0.15 mm. And the maximum 1.7 mm. Multiple winding transformers can be very large and impractical to wind and will need to be divided up into separate transformers. The lamination size only allows a certain amount of wire that can be used. You will be notified if transformer will need this problem corrected when quoted.

The size will be determined by its design and not by the customer. A 400 watt transformer cannot be built the size of a walnut.

The use of exotic or weird materials suggested by the customer will be impossible.

The transformer primary MUST be fused properly, total VA rating divided by line voltage equals line current drawn, times 133% is the fuse rating ( example, 200va/117v =1.7A times 133% is 2.2A or 2A fuse). A SLOW BLOW for solid state rectifiers or a standard fuse for rectifier tubes or slow warm up. A transformer failure is mostly due to external circuit shorts, overload and improper fusing. A larger fuse or no fuse at all for better sound is a recipe for disaster. A VERY DANGEROUS FABLE HAS BEEN INCREASING AS TO DIFFERENT FUSES OR NO FUSE OFFERING A BETTER SOUND, THIS IS NOT TRUE AND ANY RETURNED BURNED OUT TRANSFORMERS WILL BE NOT  HONORED. A fuse that is blowing out repeatedly is telling you there is a problem to locate.

If a power transformer is left on continuously it will continue to heat up and could fail. One of the other fables is, leaving an amplifier on continuously for better sound. This will only increase your electric bill, wear out your tubes faster and maybe burn your house down.

If two windings of same voltage are to be paralleled for the purpose of increasing current, it should be understood as to the proper way to connect these windings in phase or the transformer will burn out. Please indicate this need in design so phasing color code can be applied. We cannot read minds.

 

HOW TO ORDER

Information needed to order power transformers.

1. Primary voltage

2. Voltage and current of each secondary winding.

3. Mail us some thing like : I nee a proform  for a transformer as follow: Primary 230V, one secondary 35 V 3 Amp  other 20 V 1Amp.

4. We mail you a quotation  or some comentary if any problem ,in one day or so.

5. You acept  it by paying via Paypal or money transfer as proposed.

6. We' ll ship you in a week.

Payment must be made in advance by sending the total budget to be prompted and you must approve first. The powers and prices that can be done with primary  of 230 V (110 and 380 V on request ). And one secondary are: