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I see no second (EF) sample on this schematic, how is this suppose to work stable without one?
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Here's my take on Sandbanks & Proscan. Changed Gain 1000, instead of the insane 10,000; Simplified timing control; Added EF sample and integrator from Dooley TD3X; Diode for mosfet drain; PSU as in MiniPulse Plus;
Sandbanks - Proscan - GT.pdfComment
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Interesting collection of ideas, you are switching Q1 and Q3 with only 5 volts from the micro is that enough ?Here's my take on Sandbanks & Proscan.Comment
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Voltage should be right. The micro/jfets configuration is same as in Minipulse so this should work just fine.
Will the micro provide enough current, hope so !
From datasheet: "- High current source/sink for direct LED drive"..
Maximum output current sunk by any I/O pin............................................... .................................................. ... 25 mA
Maximum output current sourced by any I/O pin .................................................. ............................................ 25 mA
Maximum current sunk by GPIO.............................................. .................................................. ...................... 90 mA
Maximum current sourced GPIO.............................................. .................................................. ...................... 90 mAComment
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Here's update on the schematic. You can use PIC code from Hammerhead II thread to run this, though will probably require code tweaking.
Proscan GT.pdfComment
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Originally posted by eclipse View PostVoltage should be right. The micro/jfets configuration is same as in Minipulse so this should work just fine.
Will the micro provide enough current, hope so !
From datasheet: "- High current source/sink for direct LED drive"..
Maximum output current sunk by any I/O pin............................................... .................................................. ... 25 mA
Maximum output current sourced by any I/O pin .................................................. ............................................ 25 mA
Maximum current sunk by GPIO.............................................. .................................................. ...................... 90 mA
Maximum current sourced GPIO.............................................. .................................................. ...................... 90 mA
Scoped my MPP and yes it only uses 5 volts on gate, this could be handy for another project.Comment
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Hello Everyone,
My name Wahyu from Indonesia,
Video my PI Polones base, i modified with Mosfet IRF740
https://www.youtube.com/watch?v=WoD_NUfBYmkComment
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What happened to the sandbanks post ?Comment
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Can you show as the scheamatic or circuit of this modification?Originally posted by Wahyu View PostComment
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I built sandbanks project using a modified power supply(555 pump charge). I also modified the delay on sampling. It works very well. Depth is very good. I used NE5534 preamp stage redesign instead of 709. This is non motion pi. I also did follow up mods as described in sandbanks article.very good. The schematic posted above is fundamentally different. It resembles minipulse plus. Apples and oranges.Comment
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What did you do to the Delay ? What Follow Up Mods . Thank You.Originally posted by dbanner View PostComment
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HI
Can anyone explain what exactly is the role of the C7?
Considering the fact that Pin 8 in the op-amp LF357 is N.C!
tnx
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It looks like a mistake to me. Here's the original Sandbanks article:Originally posted by koohyar View Post
http://www.geotech1.com/cgi-bin/page...anks/index.dat
and it doesn't use an LF357. So I assume the PCB you posted is someone's modified version.Comment
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Looks like a Cap that may have been used with some other Op Amp.Comment
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The original used the LM709. It was used for Freq Compensation. Pin 1 / Pin 8.Comment
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