Whites Surf PI schematic

[6666]

These Capacitor Value Changes on "my circuit" are Because it is driving at a Higher Voltage, directly from the 555.

Hi
thats fine , keeping the drive voltage down
its not easy keeping up with all the mods
I have a bunch of 100pf's in the junk box

dare I ask about no damping resistor across the coil on the new cct ?

[chemelec]

ok on the change of value to 100 pf from the original cct
I guess somebody found this value to be better
thanks

These Capacitor Value Changes on "my circuit" are Because it is driving at a Higher Voltage, directly from the 555.

[kuraja]

I think that for Surfmaster's top performance you'd need a low resistance, low capacitance coax. cable. Preferably the one for connecting Hi Fi gear.
It is very elastic and good to use.

[6666]

ok on the change of value to 100 pf from the original cct
I guess somebody found this value to be better
thanks

[chemelec]

Hi thanks ok I thought I may have been reading the specs wrong

just a question about your redrawn cct, which is nice

on pin 6 of the CD4093 there is a 100pf cap
should it be a .001 ??? like on the original cct

No, that 100pf on pin 6 is correct.
There is also a 100pf between pin 3 of the 555 and Pin 8 of the 4093.

Gary

[6666]

Hi thanks ok I thought I may have been reading the specs wrong

just a question about your redrawn cct, which is nice

on pin 6 of the CD4093 there is a 100pf cap
should it be a .001 ??? like on the original cct

[chemelec]

chemelec

said:
from the data sheets on the net both seem to have the same slew rate
13v/us

OOPS!
I Ment to say: Unity Gain Bandwidth.
TL071 = 3 Mhz.
NE5534 = 10Mhz.

[6666]

chemelec

said

I Used the TL071, just because I have them.
But the NE5534 would probably be better as it has a Higher Slew rate.

from the data sheets on the net both seem to have the same slew rate
13v/us

[chemelec]

brother chemelec, thanks for you pictures, very nice all, and for festejado happy birthday 65 an embrace
i take any these naturaleza beauty photos for my pc images for me group, thanks
isnt copy rights? jajaja?

Actually Everything on my site is Copyright, But No problem if just for "Personal use", Or if you "Give Credit where Credit is Due"!

[detectoman]

brother chemelec, thanks for you pictures, very nice all, and for festejado happy birthday 65 an embrace
i take any these naturaleza beauty photos for my pc images for me group, thanks
isnt copy rights? jajaja?

[chemelec]

A few Comments. I Used the TL071, just because I have them.
But the NE5534 would probably be better as it has a Higher Slew rate.
However If Changed to this, the PCB needs a Slight Modification.

My Volume control arangement works really good.

[chemelec]

Hello Gary ,whats the audio transformer ratio?
Cheers
John

T26 is a Minature Audio transformer, 500 Ohm to 16 Ohm Impedance ratio.
(5.6:1 Turns ratio)

NELSON, Only Bench tested it, with fairly good results, using a 6 inch radial wound coil.

But now its in my Junk Bin, as I really have no use for it.
I was JUST Playing, I Enjoy Playing and already have most parts!

Sorry to hear your Sick.
YES, a Fantastic Trip in SA.
NEXT Trip, off to Africa!

[johnandles]

Hello Gary ,whats the audio transformer ratio?
Cheers
John

[nelson]

Hi Gary-

Nice pics you got from your last visit to our country and i hope you really enjoy it.

About Surfmaster detector and your re-draw schematic and and pcb, looks good to me.I already have made 5 of this detectors. The first pcb was the long one and was place inside of a 40 mm pbc tube.
Then i made a square pcb. Now you came with this new pcb that looks fine to build to. So , have you tested it. How about coil used and deep ranges?

Ok, now i m sick now so please if you can , snd me emails to my home at [email protected]

Regars and salutes to Jean to.

Take care

Nelson

Having some Spare Time and just using part I already have, I tried this:

http://www3.telus.net/chemelec/Surf.Temp/

Works pretty good.

Also, if anyones interested, about 800 Pictures of my recent trip to Chile, Argentina and Brazil.
Link on my Home Page.
http://www3.telus.net/chemelec

[Esteban]

Esteban, The Earthquake occured 9 days after we came home.

We are lucky men!