Transformer / Controller 12V (7864-1) is a 12V LEGO set released in 1980 with 34 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing 12V sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 20 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
1980 (46 years ago — may be retired)
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Catalog scale
34 parts listed · 20 inventory lines tracked
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Minifigures
No minifigs in inventory (brick-only or Technic set)
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Gray era
Pre-2004 set — may use old light/dark gray instead of bluish gray
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Shipping weight (est.)
~68 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
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Market value
No estimate on BrickID yet
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Parts in this set
20 parts · updating…
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Brick 1 x 83008 · ×2 · Black -
Brick 2 x 43001 · ×2 · Black -
Brick Round 2 x 2 with Axle Hole3941 · ×4 · Black -
Brick Sloped 45° 2 x 33038 · ×4 · Black -
Control Switch, Train 12V Transformer Speed Throttleupn0260 · ×1 · Black -
Electric Adapter / Transformer, Train 12V, 220V Type 17864c01 · ×1 · Light Gray -
![Electric Connector, 1 Way Male Squared [Complete Assembly]](https://cdn.rebrickable.com/media/parts/ldraw/7/765c01.png)
Electric Connector, 1 Way Male Squared [Complete Assembly]765c01 · ×4 · Light Gray -
Plate 1 x 63666 · ×1 · Black -
Plate 2 x 43020 · ×2 · Light Gray -
Plate 4 x 63032 · ×1 · Black -
Technic Axle 23704 · ×1 · Black -
Technic Axle 63706 · ×1 · Black -
Technic Axle 83707 · ×1 · Black -
![Technic Brick 1 x 4 [3 Pin Holes]](https://cdn.rebrickable.com/media/parts/elements/370126.jpg)
Technic Brick 1 x 4 [3 Pin Holes]3701 · ×2 · Black -
Technic Bush3713 · ×2 · Light Gray -
![Technic Gear 24 Tooth [Old Style - Three axle holes]](https://cdn.rebrickable.com/media/parts/ldraw/7/3648a.png)
Technic Gear 24 Tooth [Old Style - Three axle holes]3648a · ×1 · Light Gray -
Technic Gear 24 Tooth Crown with Flat Teeth3650a · ×1 · Light Gray -
![Technic Plate 2 x 8 [7 Holes]](https://cdn.rebrickable.com/media/parts/elements/373826.jpg)
Technic Plate 2 x 8 [7 Holes]3738 · ×1 · Black -
User Guide, Information Note for Parents, 12V Transformer - 108681108681 · ×1 · [No Color/Any Color] -
![Wire 12V / 4.5V with Two Leads [Undetermined Length]](https://cdn.rebrickable.com/media/parts/photos/7/x466-7-25bbfc56-279c-42a8-977e-b193111f3579.jpg)
Wire 12V / 4.5V with Two Leads [Undetermined Length]74503 · ×1 · Light Gray