EEVblog #306 - Jim Williams Pulse Generator

[free_electron]

i will try to do another run towards the end of the year. these will be kits only . No calibration as i can't get access to the scope. After the 75 kits built we know where the pulse speed is and there is no real need for calibration as you don't stand a chance getting your hands on a machine that can outrun the pulse generator ( at least not for a few decades )

i'll see if i can get a bulk order of the 2n transistors. i want the original NOS gold legged SGs transistors as they perform well ( every single one tested avalanches correctly ). i still have a few of the transistors but not enough for a second run.

[Sparky]

i will try to do another run towards the end of the year. these will be kits only . No calibration as i can't get access to the scope. After the 75 kits built we know where the pulse speed is and there is no real need for calibration as you don't stand a chance getting your hands on a machine that can outrun the pulse generator ( at least not for a few decades )

i'll see if i can get a bulk order of the 2n transistors. i want the original NOS gold legged SGs transistors as they perform well ( every single one tested avalanches correctly ). i still have a few of the transistors but not enough for a second run.

Sounds great!    I sent you a PM a little while back about future kits --- if you are maintaining a short-list, please add me!

Excited!

[ElectroIrradiator]

Yay!

+1

[van-c]

That's really good news.
--Van

[BravoV]

i'll see if i can get a bulk order of the 2n transistors. i want the original NOS gold legged SGs transistors as they perform well ( every single one tested avalanches correctly ). i still have a few of the transistors but not enough for a second run.

Wait, I thought you got a mountain pile of them ? 

Whats the alternative if there are no more of these old nos gold legged SGs ?

[free_electron]

I got about 200 left.. Two per kit .. 100 kits.. Still id like to stock a bunch more.

[alank2]

I got about 200 left.. Two per kit .. 100 kits.. Still id like to stock a bunch more.

If there is a list please put me on it.  I can't wait to get my mitts on one!!!!

[geostep]

I'm interested as well.  Add me to the "list" as well please.

- George

[Orpheus]

I'd like to be on that list, too.

[free_electron]

Patience little grashoppers. Patience. I will post updates later. November timeframe.
I got my hands on a bunch of ITT 2n2369's need to test em to see how they behave.

[alank2]

Patience little grashoppers. Patience. I will post updates later. November timeframe.
I got my hands on a bunch of ITT 2n2369's need to test em to see how they behave.

Awesome news!

[BravoV]

Patience little grashoppers. Patience. I will post updates later. November timeframe.
I got my hands on a bunch of ITT 2n2369's need to test em to see how they behave.

Suggesting to add a sma to bnc converter with adjusted price of course, I'm guessing many will like it.

[Zalexei]

Dear All,

I am a newbie here. So, sorry for maybe stupid question.
Is it possible to achieve a pulse duration (FWHM) with JW pulser of sub-ns range (I need ~500ps). After reading all thread I found that the standard kit provides ~5ns.

Thank you and best regards,
Alexey

[HackedFridgeMagnet]

You need to mention the voltage of the pulse too.

[Zalexei]

You need to mention the voltage of the pulse too.

Thanks for reminding. In fact, the peak voltage ~2-2.5V would be great. Lower voltage is not desirable. But even 200mV still acceptable.
In my application, I need to apply the generated pulses to fast laser diode (VCSEL). If the voltage will be enough I would like to connect LD directly to the pulse generator. If not. maybe SFP+ transceiver module will be needed.

[ElectroIrradiator]

It may be worth mentioning, that JW also designed a triggered version of his free running pulse generator, complete with up to 300ns variable trigger delay. Requires a +5V PSU. Check AN72, figure 75 on page 33.

[kcozens]

i will try to do another run towards the end of the year. these will be kits only.

Please add my name to the list of people interested in obtaining a kit when the next batch of them is ready.

[alank2]

Any update on these yet?

[JohnB]

i will try to do another run towards the end of the year. these will be kits only .

Please add me to your list as well.

Thanks,
John

[GingGangGooly]

I would be interested in buying a kit also

[mtdoc]

Yep, me too, me too.

[simmiv]

Yep, count me in as well for one kit..
Simmi

[arvidj]

+1 to be added to the list.

[oe6kyg]

+1 for me to

[ted572]

May I please buy one of the Pulse Generator kits (as described directly below in your Reply #477, or > PCB, Transistor, Case), what ever is easier for you, or quicker, from you also?

Thank you for considering my request, Ted572