Ugly Face Build

build your own Ugly Face!

Ugly Face is a racus squarewave guitar synth oscillator disguised as a fuzz pedal.

Originally created by Tim Escobedo on his Circuit Snippets web page, it’s become a DIY classic. The ideas here are great and inventive there are a lot of building blocks. Out of all of these the Ugly Face leaps out at your like a rabid warthog. 

The board here was design in Eagle PCB. The pots and LED are mounted to the board for easy assembly. Get boards at:

• Order Super Frequency boards from PCBWay.com
• Order from OSH Park

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Notes: Solder parts to boards without the LED or pots. Drill your box with the guide at the end of this document. Fit the pots and LED in the board without soldering. Mount the pots into the enclosure with the nuts and washers. Then fit the LED through the hole. Now solder the legs of the pots and LEDs. 

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NOTE! I found an issue with the ground connection on the output side. It’s not connected to the group plane! Otherwise everything works.

Part	Value
C1	22µ
C2	1n
C3	100n
C4	2µ2
C5	100µ
C6	470n
C7	100n
D1	1N5817
D2	LED
Envelope	B1K
Frequency	A50K-A100K
Threshold	B10K
Volume	A100K
R1	1M
R2	470
R3	100K
R4	22K
R5	1K
R6	1K
VACT	Any LED/LDR pair will work
555	7555
LM386	LM386