Ugly Face Build

The Ugly Face is a classic DIY Stompbox build. Almost a rite of passage! The circuit, by Time Escobedo, has been around since late 2002!

Here is my schematic.

Schematic

Parts List

Part Number	Value
R1	1M (Tayda, Stompboxparts)
R2	470 (Tayda, Stompboxparts)
R3	100K (Tayda, Stompboxparts)
R4	22k (Tayda, Stompboxparts)
R5	1k (Tayda, Stompboxparts)
R6	1k (Tayda, Stompboxparts)
D1	1N5817 (Tayda, StompboxParts)
D2	LED (Tayda, StompboxParts)
555 [2]	7555 (Tayda, StomboxParts)
LM386 [3]	LM386 (Tayda, StompboxParts)
Socket x2	DIP 8 (Tayda, StompboxParts)
C1	22µ (Tayda, Stompboxparts, any value 22µ to 100µ)
C2	1n (Tayda, StompboxParts)
C3	100n (Tayda, Stomboxparts)
C4	2µ2 (Tayda, Stompboxparts)
C5	100µ (Tayda, Stompboxparts)
C6	100n (Tayda, Stomboxparts)
C7	100n (Tayda, Stomboxparts)
VACT_1 [1]	LED/LDR (Tayda, Stompboxparts)
ENVELOPE	B1K 16mm (Tayda, StompboxParts)
FREQUENCY	C100K 16mm (Tayda, StompboxParts, B or C works here)
THRESHOLD	B10K 16mm (Tayda, StompboxParts)
VOLUME	A100K 16mm (Tayda, StompboxParts)

• [1] You can use any LED and LDR here. The packaged types are more expensive but convenient. You can use a discreet LED and LDR pair. You might experiment with a few of these. This part is creates for the envelope sweep you will hear the effect of these parts when you turn the Envelope up.
• [2] You should be able to use almost any 555 chip. Preferable is the NE555 or 7555.
• [3] There are several versions of this chip: JRC386D, LM386N-3, LM386N-4 any version should work.

I made a couple versions of this board. I had these manufactured at PCBWay.com. Their prototyping service is very reasonably priced and makes it easy to prototype a project on a professional quality PCB.

Here are some pictures of Ugly Face builds that I made.