parts_faq
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parts_faq [2016/06/14 14:54] psykhaze |
parts_faq [2016/06/15 12:47] (current) psykhaze [What is the correct polarity of the (resistor / capacitor / diode / etc)] |
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| ====== Parts FAQ (Frequently Asked Questions) ====== | ====== Parts FAQ (Frequently Asked Questions) ====== | ||
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| ===== What wattage resistors should I buy? ===== | ===== What wattage resistors should I buy? ===== | ||
| **1/4W** (.25watt) or higher will work fine for everything midibox, unless otherwise noted. | **1/4W** (.25watt) or higher will work fine for everything midibox, unless otherwise noted. | ||
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| ===== What voltage capacitors should I buy? ===== | ===== What voltage capacitors should I buy? ===== | ||
| The whole MBHP works on 5V, so all Caps should be at about **16V or higher**. It doesn´t matter if you go higher. | The whole MBHP works on 5V, so all Caps should be at about **16V or higher**. It doesn´t matter if you go higher. | ||
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| ===== What is the correct polarity of the (resistor / capacitor / diode / etc) ===== | ===== What is the correct polarity of the (resistor / capacitor / diode / etc) ===== | ||
| **Resistors can be installed in any direction**. | **Resistors can be installed in any direction**. | ||
| - | Smaller value capacitors (i.e. usually under 1 uF) generally have no polarity. Anything above 1 uF is typically an electrolytic capacitor, and it will have a polarity marking. Most often the "-" side is marked with a big stripe, although sometimes it's the "+" side that is marked. (Strangely, the "+" side seems to be marked on capacitors made in U.S.A.) | + | **Smaller value capacitors (i.e. usually under 1 uF) generally have no polarity**. **Anything above 1 uF is typically an electrolytic capacitor, and it will have a polarity marking**. Most often the "-" side is marked with a big stripe, although sometimes it's the "+" side that is marked. (Strangely, the "+" side seems to be marked on capacitors made in U.S.A.) |
| **//Diodes absolutely must be installed in the right direction//**. Diodes have a stripe on the cathode side. | **//Diodes absolutely must be installed in the right direction//**. Diodes have a stripe on the cathode side. | ||
| Most other components have some sort of mark as to their correct orientation. IC's will have a dot, transistors have a flat side, LEDs have a flat side (and the two leads will be different lengths). | Most other components have some sort of mark as to their correct orientation. IC's will have a dot, transistors have a flat side, LEDs have a flat side (and the two leads will be different lengths). | ||
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| - | =====The USB module requires a 1N4002 diode, the closest I can find is a 1N4004 - is this a suitable replacement? ===== | + | \\ |
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| - | Yes, 1N4004 is a replacement for 1N4002, it's just a type for higher Voltages (100V for 1N4002 vs. 400V for 1N4004). Any 1N400X diode will work in place of any other 1N400X diode -WITH A SMALLER NUMBER- Do replace a 1N4002 with a 1N4004 Don't replace a 1N4004 with a 1N4002 | + | |
| ===== What kind of switches do I need? ===== | ===== What kind of switches do I need? ===== | ||
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| When in doubt, don't hesitate to contact the distributor for clarification. This may save you some headache and some money as some do not accept returns! | When in doubt, don't hesitate to contact the distributor for clarification. This may save you some headache and some money as some do not accept returns! | ||
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| - | ====== What size/type of faders should I buy? ====== | + | \\ |
| + | ===== What size/type of faders should I buy? ===== | ||
| The physical size of the faders is not important. The pots/faders should have 10k resistance. It's important that they are linear, as opposed to logarithmic ones. The pots/faders in stereo equipment are almost always logarithmic, so you can't take one from your dad's stereo. | The physical size of the faders is not important. The pots/faders should have 10k resistance. It's important that they are linear, as opposed to logarithmic ones. The pots/faders in stereo equipment are almost always logarithmic, so you can't take one from your dad's stereo. | ||
| Trying to save money on wobbly cheap plastic faders, uh? You might hate yourself for that decision after six months of using your favorite new midi-toy. Consider that. | Trying to save money on wobbly cheap plastic faders, uh? You might hate yourself for that decision after six months of using your favorite new midi-toy. Consider that. | ||
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| ===== What type of crystal do I need? ===== | ===== What type of crystal do I need? ===== | ||
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| [[Crystals and Oscillators]] | [[Crystals and Oscillators]] | ||
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| ===== I can't find a bridge rectifier to fit the PCB's. ===== | ===== I can't find a bridge rectifier to fit the PCB's. ===== | ||
| You can substitute four 1N4001 (or any of the 1N400X series) for the bridge rectifier, they will handle more than enough current. | You can substitute four 1N4001 (or any of the 1N400X series) for the bridge rectifier, they will handle more than enough current. | ||
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| ===== What Power supply should I use, and how much power should it have? ===== | ===== What Power supply should I use, and how much power should it have? ===== | ||
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| <box round>As an approximation: Core + AINs + DINs + SIDs + bankstick ... = 50 up to 100 mA needed, LCD = 100 mA up to appr. 300 mA for a appropriate backlighting, DOUTs = appr. 30 mA per DOUT IC (four are on one module) as the outputs are multiplexed.</box> | <box round>As an approximation: Core + AINs + DINs + SIDs + bankstick ... = 50 up to 100 mA needed, LCD = 100 mA up to appr. 300 mA for a appropriate backlighting, DOUTs = appr. 30 mA per DOUT IC (four are on one module) as the outputs are multiplexed.</box> | ||
| + | ====The USB module requires a 1N4002 diode, the closest I can find is a 1N4004 - is this a suitable replacement? ==== | ||
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| + | Yes, 1N4004 is a replacement for 1N4002, it's just a type for higher Voltages (100V for 1N4002 vs. 400V for 1N4004). Any 1N400X diode will work in place of any other 1N400X diode -WITH A SMALLER NUMBER- Do replace a 1N4002 with a 1N4004 Don't replace a 1N4004 with a 1N4002 | ||
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| ===== PIC Stuff ===== | ===== PIC Stuff ===== | ||
parts_faq.1465916061.txt.gz · Last modified: 2016/06/14 14:54 by psykhaze
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