This one named EE-19 core and placed in power supply module. You only need ATX named module, this is old generation of power supplys. Most of transformers calculated as 220V input and ~8V output with 27-30KHz frequency to supply 5V stabilizer in standby mode. You can use it as a HV transformer in a very good project http://www.dos4ever.com/flyback/flyback.html