QLS QA-660 comes with a standard PCB mount multi-secondaries transformer. This is probably not a bad transformer, but most of the time I would be more comfortable with a separate transformer for some application. We need 12V and 17V. The 12V is quite common, but 17V is rather tricky.
In the middle of the night few days ago, I decided to purchase some Talema transformers online. Luckily, the supplier got stock and I gave an early morning call to confirm. I got delivery by the afternoon. What a great and efficient process! I knew I wouldn’t be able to get 17V secondary, so I went with 18V. Hope they forgive me on this 😉
Quite tricky to get detail picture of some regulator. With the help of small mirror from my wife, I manage to shoot the picture on the mirror. Whoa, a 7805 regulator? I hope it’s for supplying power to display only.
Another tricky shot to capture 7808 regulator. Hmm….
With the help of my ‘macro’ lens, I manage to get the detail of this SMD type diode.
Push and pull between 317 and 337.
Basic structure of QLS QA-660 power supply. We have 3 rails, each with dedicated secondary. Need to trace a bit more to get deeper analysis.
Agus
December 3, 2012 11:22Mantep ko… tunggu Oscon, ADP 151, schottky diode,dkk…
Ditunggu updatenya..
Salam 🙂
Calico
December 6, 2012 13:55Salam kenal,
Pingin tahu jadinya sebagus apa nih kl di mod abiz.
Salam
Picasaweb.google.com/auahlap
triodethom
December 8, 2012 08:14The rectified voltage is 25.2 rather than 23.4 so still with in the regulators limits. It may be slightly higher with this lite load but still ok. Some heat may increase on the regs but still should be ok . The u1d are ultra fast 200 volt diodes in a full wave bridge setup with the 4 diodes but only 1 amp so the cap size will need to be limited to prevent current spikes. Good luck I want to hear how it goes.