Muller Dynamo

[romerouk]

Now I have tested a fast recovery type diode, RHRP8120 (1200V, 8A, with less than 55nanosec reverse recovery time) made by Fairchild. Using again a transistor curve tracer, I found 1.3V forward voltage drop across it with 1A forward current. Then I paralleled a 1N4007 type diode with it and the combined forward voltage drop was reduced to 0.84V at the same 1A current.
1.3-0.84=0.46V  this means that at 1A current the load can receive 1*0.46V=0.46W more power which would have been lost across the single RHRP8120 diode should it have been used.  For a 2A current this is already near to the 1W 'gain' towards the load which would never have reached the load via the single diode. 
In a full wave diode bridge, there is always two diodes ON at a moment, meaning nearly 2W 'gain' towards the load as useful output, for 7 gen coils this is nearly 14W 'extra' power, just regained from diode loss. (Assuming in this example that the diode bridge diodes have a similar forward voltage drop like my randomly chosen RHRP8120 type had.

So now it is quite understandable why Romero found that connecting 1N4001 or 1N4007 diodes in parallel with the inside diodes of an off the shelf high current diode bridge the output power increases in a not negligible way. Even if you regain a few Watts from the diodes loss, it can be useful for the load, or can be just the missing some Watts for looping...

rgds,  Gyula

Thank you Gyula to confirm this. It is so easy to test and people still did't try it to see if it is true or false. This can be considered in many applications and do not underestimate that few mwatts extra you get. Diodes can do even more beautiful things...

Have a nice day,
romero

[penno64]

Hi all,

If I flip my top coils (wires only) I get less voltage and current but the unit accelerates under load.

If I put them back to normal I get more voltage but I feel it acts like a normal
generator and slows under load

[nul-points]

Hi all,

If I flip my top coils (wires only) I get less voltage and current but the unit accelerates under load.

If I put them back to normal I get more voltage but I feel it acts like a normal
generator and slows under load

hi all

when you've digested the implications of this, you might want to look at the latest info on Romero's scope trace i posted on the 'experimentalist' thread
(follow the link i posted above, earlier)

it appears that Romero's coil pairs may have been connected in opposition (ie. which penno just described as giving acceleration under load)

just thought this might be important 


http://docsfreelunch.blogspot.com

[romerouk]

@penno64
Just for my curiosity can you please answer me to the folowing questions?

What is the dimenstions of your coils?
What is the dimension of your core and type of material?
What type of wire and how many turns?
What size are the magnets and what grade?
What is the speed you get at 12 volts input?
What is the speed you get at 6 volts input?
Voltage... not important.


Thank you!
Romero

[penno64]

Hi Romero,

I love my pinball machines

My coils are 35mm x 28mm with 12mm core size The winding is single 27g x 1300 turns
My core are ferrite tubes 20mm x 12mm with hole 5mm
the magnets are 25mm x 5 mm N35

Speed etc I will post tomorrow.

What is most interesting is the scope shot with ref to DC ground when I flip the top coils.
It looks like a DC Pulse train (square ware). I'll post pic tomorrow

Regards, Penno