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Leaky bucket

tpcarlson·synth-diy·leaky-bucket/leaky-bucket.kicad_pcb

Leaky bucket PCB layout, top view — open source board by tpcarlson
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About the Leaky bucket PCB

Leaky bucket is an open source PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 20 × 128.5 mm, with 110 components from 29 distinct parts.

Other key parts include the NE555D, 74LS90, 74LS42, 74LS74 and TL072. By type, the board carries 52 capacitors, 16 ICs, 16 resistors, 11 transistors, 8 connectors and 3 diodes.

It belongs with the audio designs in this gallery.

From the project

Mostly Eurorack projects

Ivy is a phaser build around a number of switched capacitors. In some ways, it's a little bit like a strange varient of a BBD.

As measured by the joranalogue Test 3, around ?? mA on +12v and ?? mA on -12v at peak. The 5v rail is unused.

The core circuit is based on an Elektor Magazine design from the 1970s. A copy of the article is availbe on archive.org. The Eurorack specifics, along with the 555 timer to control the switching rate, are a little more original.

Leaky bucket, from the project README
From the project README

Main components on the Leaky bucket

NE555D74LS9074LS4274LS74TL07274LS00L78L05_TO92

Leaky bucket bill of materials (BOM)

110 components, 29 distinct parts.

QtyPartRefs
1
NE555D
U1
1
74LS90
U2
1
74LS42
U3
1
74LS74
U4
1
TL072
U5
10
74LS00
U7, U8, U9, U10, U11, U12, U13, U14 +2
1
L78L05_TO92
U17
1
BC548
Q2
10
MMBT3906
Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19 +2
3
AudioJack2
J1, J2, J4
1
Conn_02x05_Odd_Even
J3
2
Conn_01x04
J5, J7
2
Conn_01x04
J6, J8
1
R_Potentiometer
RV1
1
SW_SPDT
SW1
1
1N4148WS
D1
2
D_Schottky
D2, D3
2
FerriteBead_Small
FB1, FB2
1
4.7n
C1
1
10n
C2
Show 9 more
QtyPartRefs
4
100n
C3, C9, C11, C12
3
100n
C4, C5, C6
2
47u
C7, C8
1
330n
C10
40
150n
C13, C14, C15, C16, C17, C18, C19, C20 +32
4
1k
R1, R2, R4, R6
1
10k
R3
1
100k
R5
10
680R
R7, R8, R9, R10, R11, R12, R13, R14 +2

Leaky bucket design files

The KiCad project lives in the tpcarlson/synth-diy repository on GitHub; these links point at the commit this page was built from.

Leaky bucket: common questions

How big is the Leaky bucket PCB?

The Leaky bucket measures 20 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Leaky bucket?

110 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Leaky bucket design files?

From the tpcarlson/synth-diy repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Leaky bucket design in my own project?

The repository has no license, so all rights stay with tpcarlson. Use it as a reference, and ask the author before reusing the design.

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