Comments on: Making A Working Jim Williams Based Pulse Generator

By: Albert van Bemmelen

Albert van Bemmelen — Tue, 19 Oct 2021 09:18:48 +0000

Update 12 october 2021: the final CTE external calibration step recently was not done by using the in this article made Jim Williams Fast Rise Pulser. Instead I used my about <50 (?) years old second hand bought Systron Donner 100A Pulse Giver to pass this final Tektronix 2440 scope test! Which also can be read in the posts after Part4 of my 2440 scope repair. The needed about 100KHz square wave calibration pulse is not critical. And afterwards my Jim Wiliams pulse giver tested my scope's bandwidth giving the about 300 MHz that was expected.

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By: Albert van Bemmelen

Albert van Bemmelen — Mon, 13 Sep 2021 06:01:19 +0000

PS2: There is a real practical reason behind this article why I build this Jim Avalanche Fast Pulse Generator! I need it to calibrate my Tektronix 2440 350MHz Memory oscilloscope in one of the calibration step procedures. Without it my Tek 2440 never will work correctly on the external calibration that also needs to be executed after the internal - automatic - calibration was done.

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 11 Sep 2021 07:48:54 +0000

PS: I also designed a perfectly matching 3D printable case to place these OSH Park Generator boards safely in. By changing and testing another found design until it was right so it exactly fitted the measurements of the boards with the connectors on it.

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By: William Shaw

William Shaw — Tue, 29 Jun 2021 21:32:53 +0000

In reply to ALBERTO GRACIANO LAPA.

A step up in the theory department! Very much appreciated. Not absorbed immediately by the less than experienced on first reading but very helpful in extending our knowledge base.
Thank you!

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By: ALBERTO GRACIANO LAPA

ALBERTO GRACIANO LAPA — Sat, 19 Jun 2021 21:13:40 +0000

Excellent

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By: Albert van Bemmelen

Albert van Bemmelen — Fri, 18 Jun 2021 22:37:42 +0000

Nice thing to know is that Kerry Wong's Jim Williams avalanche pulser circuit didn't use a LT1073 with special HV fast recovery rectifier diodes to generate the needed high voltage that enables the fast recovery HF transistors to avalanche. Like the special MURS120 diodes used in the OSH Park circuit. He instead just used several very cheap 1N4148 diodes to generate the HV +120V output which is quite remarkable!

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By: Waleed Rishmawi

Waleed Rishmawi — Fri, 18 Jun 2021 09:27:41 +0000

very deep informative article, nice explanation and detailed photos. I thank you for sharing it, I am sure it took you a while to make and write the article. have a blessed day

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By: Parasuraman S

Parasuraman S — Fri, 18 Jun 2021 04:47:13 +0000

Very informative article in building electronic devices, in this case, the most essential Pulse Oximeter during this Pandemic period. Well done and many thanks for sharing!

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