Author Topic: EEVblog #306 - Jim Williams Pulse Generator  (Read 242608 times)

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Offline Christe4nM

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #150 on: January 02, 2013, 07:06:22 pm »
I can always do another run at itead. But then we need to organize it more so i can buy larger quantity and get price down.
Good idea, count me in
 

Offline spelunker

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #151 on: January 02, 2013, 07:16:10 pm »
I can always do another run at itead. But then we need to organize it more so i can buy larger quantity and get price down.
Good idea, count me in


Hi,

YES, you may count me in also.

George
 

Offline EV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #152 on: January 03, 2013, 02:07:39 pm »
Hi  free_electron

Are you going to do more these kits and sell them on eBay?
I am interested to buy one.
 

Offline free_electron

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #153 on: January 03, 2013, 03:44:49 pm »
Right, lets do another run. I will modify the board slightly in two aspects : a slit in the back that allows you to easily solder a stub of 'hardline' ( rigid coax) so people can experiment withe stretching the pulse.

A different power switch. The current one is a bit iffy to stick through the side of the box. I will stick it through the top. Instead. I'll see if i can lasercut the holes for switch and led in the boxes.

If you want kits: post your name and how many. I will leave this open until the 20th of january. After that i collect the count and order boards and parts (iteadstudio and digikey/mouser). Shipping inside us is around 6$ outside about 15. I use the standard flat-rate  small usps box.
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Offline fmaimon

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #154 on: January 03, 2013, 04:34:04 pm »
I'm in for 2 kits!
 

Offline EV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #155 on: January 03, 2013, 04:55:39 pm »
@free_electron

I sent an email to you.

2 pcs
« Last Edit: January 03, 2013, 06:29:17 pm by EV »
 

Offline Neganur

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #156 on: January 03, 2013, 06:26:54 pm »
2
 

Offline tymm

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #157 on: January 03, 2013, 07:23:27 pm »
I would be in for 2 -- thanks!
 

Offline Christe4nM

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #158 on: January 04, 2013, 10:21:26 am »
Yep I'm in: 1 is fine for me
 

Offline BravoV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #159 on: January 04, 2013, 10:30:26 am »
FE, any chance to use BFG541 instead of 2N2369 ?

Its much cheaper (checked thru findchips) and with the same price as single 2N2369, you can supply more than one for the BFG541s in the kit for us to play/select among them and spares as well just in case it went kaput, also its hell a lot faster too (150 ps) and less voltage.  Info HERE

If you're going with BFG541 , count me in for 1.

PS : Although there might be some extra work for adapting with the new footprint at the pcb.
« Last Edit: January 04, 2013, 10:35:21 am by BravoV »
 

Offline TorqueRanger

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #160 on: January 04, 2013, 03:45:44 pm »
Right, lets do another run. I will modify the board slightly in two aspects : a slit in the back that allows you to easily solder a stub of 'hardline' ( rigid coax) so people can experiment withe stretching the pulse.

A different power switch. The current one is a bit iffy to stick through the side of the box. I will stick it through the top. Instead. I'll see if i can lasercut the holes for switch and led in the boxes.

If you want kits: post your name and how many. I will leave this open until the 20th of january. After that i collect the count and order boards and parts (iteadstudio and digikey/mouser). Shipping inside us is around 6$ outside about 15. I use the standard flat-rate  small usps box.
What is this going to cost beside the shipping???
 

Offline EV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #161 on: January 04, 2013, 03:59:49 pm »
I don't know, but the old price seems to have been $ 28 on eBay.
 

Offline olepr01@gmail.com

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #162 on: January 04, 2013, 07:40:59 pm »
1 kit pls  :)
 

Offline free_electron

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #163 on: January 08, 2013, 09:56:53 pm »
people who are on the list so far :


Christe4nM 1x
Spelunker 1x
EV 2x
fmaimon 2x
Neganur 2x
Tymm 2x
BravoV 1x with BFG
 olepr01@gmail.com 1x
Wsalden 1x
« Last Edit: January 08, 2013, 09:58:28 pm by free_electron »
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Offline nadona

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #164 on: January 09, 2013, 12:12:40 am »
I like to have one, too.
Ha-ha-ha. That's good, too!
 

Offline Barryg41

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #165 on: January 09, 2013, 12:56:32 am »
I will take one also.
 

Offline olegjay

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #166 on: January 09, 2013, 01:32:57 am »
Please put me in for one.
 

Offline Echo88

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #167 on: January 09, 2013, 11:52:16 am »
Id like to have one too, please.  :)
 

Offline casinada

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #168 on: January 11, 2013, 05:42:28 am »
+1 :)
 

Offline free_electron

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #169 on: January 11, 2013, 06:24:34 am »
I am running this project on another forum where i am active as well. The goal is to bring the price down and benefit both forums. Now, here is a bit more information :

Due to the volume i will do a bulk order of PCB's . This means  you will be able to order just the PCB. Cost is probably going to be around 2 to 3 US$ for the bare pcb + shipping. Since that can be in an envelope shipping anywhere in the world could be like 1.5$ ...
People wanting just the bare board : let me know how many you want : i will add to the PCB column. Two or 3 pcb's in an envelope should work. More would push shipping up a few dollar.
If you wan tsome extra blank pcb they can be added to the kit for just the cost of the board. the shipping box for the kit is large enough and it has no impact on the price.

CAL option . This is a CALIBRATED version. I charge 5$ for this privilege . What i do is build the Pulse section. I install the 10 meg , 10k 2pf , 50 ohm , transistor and sma connector. Verify the system does generate correct pulses and i make a screenshot from the pulse of YOUR unit. You get the screenshot in electronic format by email. The measurement will be done using a very fast scope. I will post the scope model number tomorrow. i need to look it up. It's got 20Ghz analog bandwidth ( i believe) . So you need to solder the entire switcher section.
*** THE 5$ CAL FEE FROM ORDERS ON THIS FORUM WILL BE DONATED TO THE SAGAN FUND ***

Due to the combined action i can shave off a few dollars. I will post a final price end of next week ( when the order time closes ) . Due to chinese new year coming i need to order then.
Any excess money due to penny pinching will be donated to the 'Sagan fund' as well.

( note only the 5$ from EEvblog users goes to the Sagan fund. The Cal fee from the other forum goes to the other forum to pay their bandwidth ( they are a free forum also) . Trying to keep things fair. )

people who are on the list so far :

Code: [Select]
                  Kit   : CAL  :  PCB
Christe4nM         1x   :      :
Spelunker          1x   :      :
EV                 2x   :      :
fmaimon            2x   :      :
Neganur            2x   :      :
Tymm               2x   :      :
BravoV             1x   :      :           with BFG
olepr01@gmail.com  1x   :      :
Wsalden            1x   :      :
nadona             1x   :      :
Barryg41           1x   :      :
olegjay            1x   :      :
echo88             1x   :      :
casinada           1x   :      :

so let me know what features you want so i can finetune the table above.
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Offline BravoV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #170 on: January 11, 2013, 06:44:48 am »
Geez.. why I'm the one who only want BFG ?  ??? Also is there any plan to adapt the pcb for the BFG's footprint ?

Vincent, on every kit, does it came with "more than" one transistors ? I'm worry only one is not enough, whats you plan on how many you're going to purchase on this BFG ?

Btw, I can't lurk here all the time waiting for your announcement at ebay, cause prolly I might missed the bidding. Don't have any problem at all paying you in directly in advance on CAL'ed version, please PM me your paypal addie.
« Last Edit: January 11, 2013, 06:47:05 am by BravoV »
 

Offline EV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #171 on: January 11, 2013, 07:34:27 am »
I take also the kits as calibrated. I can also pay directly in advance to you, if you mail your paypal address to me.
 

Offline andyturk

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #172 on: January 11, 2013, 07:40:19 am »
Put me down for one calibrated kit please.
 

Offline free_electron

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #173 on: January 11, 2013, 07:56:31 am »
I will accept paypal directly. No problemo.
The pcb will not be adapted to the bfg footprint. Simply solder the tab of the bfg in the hole of the 2n, use one of the emitters to inject into the sma and use a short piece of bare copper to tack down the base.

The transistor needs to be floating to guarantee as fast a pulse as possible. I looked at the pinout of the bfg so you can solder it like that without problems.

For the bfg i was going to get you as a courtesy. Two or three. I will not test those as it is not the jw design. Anyone is free to play with any transistor he wants. The board is made for the 2n2369. The kit will have two of those and i will test both to see if they avalanche around 40 to 60 volts.
 I cannot start buiding custom kits for everyone. Is you want to play with crazy things : get a few bare boards.
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Offline BravoV

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Re: EEVblog #306 - Jim Williams Pulse Generator
« Reply #174 on: January 11, 2013, 08:09:46 am »
Thank you Sir !  :-+ Check your PM please.


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