Components & Parts
Individual replacement parts and extra components for every Mr Circuit lab kit — the exact same parts that go into each kit, sourced and tested by Gary.
Ships same day
Made in USA
Exact-match lab parts
POs welcomed
Running a classroom? You'll need extra circuit boards.
Add circuit boards
MC1-SET includes one solderless circuit board in kit MC1-00. For students working simultaneously, add one board per student — $3.95 each.
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Mr Circuit MC1 Kits
34 products
Resistors 1/2W ±5 Tan Carbon Film
134 products
Resistors 1/2W ±5 Blue Carbon Film
63 products
1206 Surface Mount Resistors
175 products
0805 Surface Mount Resistors
170 products
0603 Surface Mount Resistors
170 products
0402 Surface Mount Resistors
170 products
0201 Surface Mount Resistors
170 products
Electrolytic Capacitors
169 products
Ceramic Disc Capacitors
82 products
Zener 1/2 Watt (500mA)
34 products
Zener Diodes 1 Watt
28 products
Trimpots 6x6 Side-Adjust 0.1 Watt
14 products
| Product | Stock | Price | Qty & Add to Cart | |
|---|---|---|---|---|
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Trimpot 6x6mm Side-Adjust 100 Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 200 Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 500 Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 1k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 2k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 5k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 10k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 20k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 50k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 100k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 200k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 500k Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 1M Ohm - Pack of 10 | Low stock |
$4.95 each |
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Trimpot 6x6mm Side-Adjust 2M Ohm - Pack of 10 | Low stock |
$4.95 each |
Trimpots 6x6 Top-Adjust 0.1 Watt
13 products
| Product | Stock | Price | Qty & Add to Cart | |
|---|---|---|---|---|
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Trimpot 6x6mm Top-Adjust 100 Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 500 Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 1k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 2k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 5k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 10k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 20k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 50k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 100k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
![]() |
Trimpot 6x6mm Top-Adjust 200k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
![]() |
Trimpot 6x6mm Top-Adjust 500k Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 1M Ohm - Pack of 10 | Low stock |
$4.95 each |
|
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Trimpot 6x6mm Top-Adjust 2M Ohm - Pack of 10 | Low stock |
$4.95 each |
LEDs
5 products
| Product | Stock | Price | Qty & Add to Cart | |
|---|---|---|---|---|
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Red LEDs T 1 3/4 diffused -Pack of 50 - (06001-50) | In stock |
$5.00 each |
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Yellow LEDs T 1 3/4 diffused - Pack of 50 - (06002-50) | In stock |
$5.00 each |
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Green LEDs T 1 3/4 diffused - Pack of 50 - (06003-50) | In stock |
$5.00 each |
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Blue LEDs T 1 3/4 diffused Pack of 50 - (06004-50) | In stock |
$6.00 each |
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Clear (White) LEDs T 1 3/4 diffused - Pack of 50 - (06005-50) | In stock |
$5.00 each |
Nine Volt Snaps
2 products
| Product | Stock | Price | Qty & Add to Cart | |
|---|---|---|---|---|
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9-Volt BATTERY SNAPS 6-inch stranded leads for soldering - Pack of 2 - Free Shipping | In stock |
$3.98 each |
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9-Volt BATTERY SNAPS 3-inch solid leads for Solderless Circuit Board - Pack of 2 - Free Shipping | In stock |
$3.99 each |
Mr Circuit Bulk Parts Replacements
33 products
Same-day shipping
Orders placed before 2 PM MST
Made in USA
Assembled in San Luis Obispo, CA
Exact-match parts
The same components in every kit
POs accepted
School purchase orders welcome





























































































































































































































































































































































































