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TOPIC: pedalSHIELD Bill of Materials and Alternatives

pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #392

Ray OFFLINE Moderator Posts: 695 Thank you received: 148 Karma: 42	Hi, yes we have replacements for all of them. Im not at home right now, but later this evening I will post all que equivalent part numbers.
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pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #393

aknudsen OFFLINE New Member Posts: 10 Thank you received: 1 Karma: 0	Thanks! I take it you will update the Mouser BOM then?
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pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #394

Ray OFFLINE Moderator Posts: 695 Thank you received: 148 Karma: 42	These are the equivalents: Some of the parts cannot currently be resolved at Mouser: 140-50S5-271J-RC ECQ-V1H104JL ECE-A1HKA010 1-390261-2 3319W-3-504 D271K20Y5PH63L6R I buy this in Farnell but any standard 100nF film will work fine(like R82EC3100DQ70J) ECE-A1HKA010 517-4808-3004-CP 3319W-1-504
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pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #401

aknudsen
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Ray wrote:

These are the equivalents:

Some of the parts cannot currently be resolved at Mouser:

140-50S5-271J-RC
ECQ-V1H104JL
ECE-A1HKA010
1-390261-2
3319W-3-504

D271K20Y5PH63L6R
I buy this in Farnell but any standard 100nF film will work fine(like R82EC3100DQ70J)
ECE-A1HKA010
517-4808-3004-CP
3319W-1-504

ECE-A1HKA010 is obsoleted though, did you find a replacement for this?

ECE-A1EKA4R7 is also out of stock, with a lead time of 16 weeks.

Last Edit: 4 years 5 months ago by aknudsen.

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pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #403

Ray OFFLINE Moderator Posts: 695 Thank you received: 148 Karma: 42	ooops sorry! Ive just copy/paste it from my last order, let me give you updated an available references when I arrive home.
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pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #405

Ray OFFLINE Moderator Posts: 695 Thank you received: 148 Karma: 42	ECE-A1HKA010 is obsoleted though, did you find a replacement for this? Any standard 1uf electrolytic will do, I would suggest: USR1H010MDD Different manufacturer but 1uF 50 v and same dimensions 4x7mm ECE-A1EKA4R7 is also out of stock, with a lead time of 16 weeks. I would use 667-ECE-A1HKA4R7 (same brand, dimensions 4x7, 4.7uF and 50V)
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pedalSHIELD Bill of Materials and Alternatives 4 years 5 months ago #406

aknudsen OFFLINE New Member Posts: 10 Thank you received: 1 Karma: 0	Thanks again, looks as if the BOM is complete now.
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pedalSHIELD Bill of Materials and Alternatives 3 years 14 hours ago #868

Ray
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Hi, some folks ask me frequently for the 0.47 capacitors to be used in (C1 C4 C6 C7 C10 C11).
By doing this you are allowing lower harmonics to go into the circuit, the standard combination 100K resistor with 100nF cap attenuates values below 15Hz.
Using a 470nF, the whole deep spectrum down to 3Hz can go into the circuit.

By saying that 15Hz is pretty low, but if you want to experiment or you have some caps around you can try.
Any radial, through hole, ceramic capacitor between 470nF, 510nF 680nF with a voltage of 16V or higher will work. (Take care, if the voltage is too high, like 500V or so, they can be bulky and difficult to fit)

These are some Mouser suggestions:

www.mouser.co.uk/ProductDetail/TDK/FG14X...3KuujxEOfk3DSw%3d%3d

www.mouser.co.uk/ProductDetail/TDK/FG18X...DJDgDSJhre5xLg%3d%3d

www.mouser.co.uk/ProductDetail/TDK/FG26X...ahwTFFTbRCUr4g%3d%3d

www.mouser.co.uk/ProductDetail/Vishay-BC...F%252bPCiBYGAO0a0%3d

Last Edit: 3 years 14 hours ago by Ray.

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pedalSHIELD Bill of Materials and Alternatives 2 years 7 months ago #1047

menezes OFFLINE New Member Posts: 3 Thank you received: 2 Karma: 1	Can the 50k resistor (R7 - actually 49.9k) be replaced with some other value? I'm having some trouble finding those locally.
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pedalSHIELD Bill of Materials and Alternatives 2 years 7 months ago #1050

Ray
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Can the 50k resistor (R7 - actually 49.9k) be replaced with some other value?
I'm having some trouble finding those locally.

R7 value is the equivalent of R8 in parallel with R6 (100K//100K=50K) this resistor is used to equalize the offset currents and avoid having voltage offset at the output of the op-amp.

Since we are using a JFET op-amp (TL072) this offset currents are very low so you can build the pedal without this resistor:
Place any resistor from 0ohms (a wire shorting the pads) to 50K and it will work.

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