help re: java boost clone

[dansamp]

hope someone can answer this quick question
i am building a java boost clone using torchy's vero layout and i only have a 1N4001 diode can i sub this for the 1N4002 that the schematic calls for, if so how will this be different

thanks in advance

dan... :roll:

[bryantbr]

I think the difference is the 4001 = 50V and the 4002 = 100V

I could be wrong.  Anyone??
http://www.fairchildsemi.com/ds/1N/1N4001.pdf

[bryantbr]

Dan,
How good are you at tracing effects?  I have some very good close up photos of this effects board front and back.  I'm having trouble nailing down the schematic and PCB in ExpressPCB.  I've got about 90%.  Thought you might be able to help.

[dansamp]

thanks.....


maybe i can help
what's your question??

[bryantbr]

Do you use ExpressPCB?

[dansamp]

sorry no i don't :cry:

[bwanasonic]

hope someone can answer this quick question
i am building a java boost clone using torchy's vero layout and i only have a 1N4001 diode can i sub this for the 1N4002 that the schematic calls for, if so how will this be different

That diode is for polarity protection and will not affect the sound. It is to prevent frying the nice Ge Transistor you need for a Java/ Rangemaster.

Kerry M

[bwanasonic]

Dan,
How good are you at tracing effects?  I have some very good close up photos of this effects board front and back.  I'm having trouble nailing down the schematic and PCB in ExpressPCB.  I've got about 90%.  Thought you might be able to help.

It's a Rangemaster with a tone control. The schematic is available from www.robertkeeley.com .

Kerry M

[amz-fx]

Yes, the Java Boost schematic is in the manual: http://www.robertkeeley.com/manuals/java_boost.pdf

-Jack

[bryantbr]

Yes, I know, I have the manual.  The schematic is STILL wrong.  There have been numerous posts here about it.  Torchy's stripboard layout and schematic is the closest I've seen but still not exact.

[O]

Do you use ExpressPCB?

I know I wasn't the one being asked, but at the risk of hijacking the thread...  :?

I have been using ExpressPCB and so far I've churned out about 5 original layouts. If there's anything I can do to help, just let me know (PM).

[/end hijack]

[dansamp]

IT'S WRONG !!!!!!!!
boy that sucks!!!!! :x  :x

what am i going to do now??

[bryantbr]

I'm not saying the one Torchy has done is wrong or won't work.  I certainly don't know enough about it to make a claim like that.  I think it's been talked about here quite extensively that schematic that mr. K puts out has some inaccuracies.  I haven't built Torchy's stripboard layout yet but I plan to.

If anyone has built it I would like to know how it turned out.

[modmod]

R.G has mentioned that Keeley's own schematic is wrong and you will fry your pricy oc44..........and i see torchy is using the same schematic ? anyone can confirm that,i got only one oc44 here  :?

[Fret Wire]

His FuzzHead schematic was also inaccurate. As far as the Java goes, print up his Java schematic, print up a real Rangemaster schematic, compare, and any errors should be obvious, excluding his tone control and cap switching. It also is wired PNP, neg ground.

[Ben N]

It has also been suggested here before, I think by Pete Moore, to wire it up with a socket and use a cheap PNP silicon tranny, like a 2N3906, for tesdting purposes.  (I'm sure there is one closer to the correct hfe.)  Seems like a good idea, before exposing that "pricey OC44" to any potentially life-threatening electrons.
Ben

[kusi]

is this correct?



greetings kusi

[cd]

is this correct?

Hot dog, we have a weiner!

Remember, if you want to make a PNP positive ground effect negative ground, 9V becomes ground, ground becomes 9V, and you flip all the electrolytics around.  No guarantee it will work perfectly without oscillation or other weirdness though.

FYI, a better schem is here:

http://generalguitargadgets.com/diagrams/geb_rm_sc_pn.gif

[bryantbr]

Kusi,
That looks good.  The cap off the Level pot is 100n (0.1uf/104) instead of 10n.  Atleast on the board I've seen.  I can't post the pictures until I get home the net nazi's here at work restrict us from gettting to any image hosting sites.

[bryantbr]

Kusi,
I used your schem in PCB Express and I still can't get all the pins/leads to match up.  Take a look at the pics and see what you think.  There is a trace under the input cap socket connecting the top lead of C2 to the top lead of C1.