If I've heard that 1000 times... 0.6v is the point at which silicon _begins_ to conduct. Check some rectifier diode data sheets for V drop at i rated.
yes, Vpeak is about 1.5v less per additional diode drop.
:)
NT
NT
Actually, under decent power, a power diode drops about 1V.
The bridge will see a normal sine wave for virtually the whole cycle but with a point of inflection at the zero crossing but the capacitor will be unaffected by this. Yes of course it will smooth to a different voltage but that is what you are try to achieve isn't it??
Bob
The correct different voltage would be useful
Having had a closer look, it looks pretty crude - 2 diode bridge and a regulator - bet it'll work with 9-0-9
As long as I can achieve the tight footprint
Hmm,
Way back when the RS catalog was a single volume and usefull ( it had application notes which were good enough for you to pretty much design a project from! ), they used to sell a transformer 'kit' where you wound your own secondaries as required. The primary was pre-wound, IIRC. You then assembled the E and I laminations and glued the whole shebang together or somesuch. Haven't noticed it in there recently.
You need to look at the V/I curves on the manufacturer's spec. sheet.
Could be 2V. or 3V. if something were to draw 100A. for 1 microsecond.
OK with a full wave (not a bridge) rectifier and a 9-0-9 you will get
12-13v dc depending on load with ripple depending on the capacitor. If it then regulates with a three terminal LM340/7800 series regulator , that needs about 2v head room from the troughs in the input ripple. Should be OK if the regulator is down to 5 or 6 volts but marginal if too much higher. You might be able to increase the value of the revervoir capacitor as modern farads tend to be physically smaller. Not sure if that breaks your modification rules though?Worth a try as it sounds like you have few other economic options.
Bob
As I said before - it's a 2.5VA transformer
we're talking 100mA range her, so, as I said - about 0.7V
Actual Vdrop depends on the diode, they vary a far bit, and also on the circuit conditions.
If we estimate 25% regulation for a 2,5VA trafo at 9v, that's 280mA mean. At 25% regulation, the conduction window will be in the vague region of 25% of the time, so when conducting diode current average =3D around 1A.
NT
I remember those. They had 2 or three ratings IIRC. You can still get the 100VA version here:
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