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I want to conceive a pic programmer i found this circuit but i didn't find 1n4148 can i remplace it with 1n4001/1n4007 in this circuit It affects the pic or dysfunction of the system in speed ou current pic Programmer


marked as duplicate by Scott Seidman, Voltage Spike, ThreePhaseEel, Wesley Lee, pipe Feb 28 '17 at 15:46

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  • \$\begingroup\$ Ya a 1n4001 will be fine. \$\endgroup\$ – Trevor_G Feb 27 '17 at 21:40
  • \$\begingroup\$ 1n4148 is a small-signal diode, the 1n400x are rectifier diodes that can handle power but might be slower or have higher forward voltage. 1N4148s are dirt cheap and readily available. If you can source the zeners then you can source the 48s or something similar. \$\endgroup\$ – user1890202 Feb 27 '17 at 21:46
  • \$\begingroup\$ But please go ahead and try it will probably work. \$\endgroup\$ – user1890202 Feb 27 '17 at 21:48
  • \$\begingroup\$ wondering what the little circuit top right is supposed to do... \$\endgroup\$ – Trevor_G Feb 27 '17 at 22:11
  • 2
    \$\begingroup\$ The diodes can only protect as fast as they can respond. Fortunately the PIC already has small Schottky diodes on those pins for a certain amount of uJ protection from ESD. This has a higher forward voltage. So a Schottky diode is preferred. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Feb 27 '17 at 22:13

You can use a 4007 here. Orr a shottky diode, or a small signal BJT. Pretty much anything works here, other than high power rectifiers


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