componentspcbpower electronicsshort-circuit
I've been looking for 115v primary 9v secondary 3.2va power rating PCB transformer and couldn't find any to replace the one that was fried. All I find is dual one, instead for example 4 pins it has 8 pins, and 220v once.
Could I use 220v primary 9v seconday 3.2va even the input is 110v?
It's for coffee machine Saeco.
Can I use the dual output and just use one pin?
Here is a picture of a transformer I need (size and shape)
Thank you
For the power level you need, the transformer can be small, here is an example part (yours would be the smallest, datasheet here with dimensions):
You'll note it says 2 x 5V for the secondary, but you only have to use one of the secondary windings.
For a switching supply, here is a small module that takes 85V-265V and outputs 5VDC, the dimensions are 26.7mm by 31.7mm:
Here is an example schematic, based on a teardown of the iPhone charger:
The above came from this site.
I have a transformer with dual input 115 V and dual output 9 V and rating power 1.15 VA.
Output current will be \$ I_{MAX} = \frac {P_{MAX}}{V} \$.
simulate this circuit – Schematic created using CircuitLab
Figure 1. 230 V and 115 V primary connection.
I got no reading from center tap to any other winding.
It's probably a polarising pin to prevent it being inserted the wrong way into a PCB. Other similar transformers would have different pin spacing on primary and secondary for this reason.
Best Answer
simulate this circuit – Schematic created using CircuitLab
Figure 1. Double-primary, double-secondary wiring options.
The twin 110 V primary type transformer can be configured as shown in Figure 1 (a) and (b) to work on either 220 V or 110 V wiring. Just ensure that the transformer VA rating matches or exceeds that which is replacing - and given that the original burnt out "exceeds" would be better.
You may have to stand it off the board and connect with flying leads.