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
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2023/03/UglyFace_01.png?resize=1556%2C936)
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.
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/6F9D2EE6-9A5C-4CAE-9F7D-7C1A26E2EB0B.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/06/335DE119-382C-434D-9E48-48120458FFA3.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/06/E2FCAAEA-C8F4-4AE9-9A95-F1F5EF25ABF0.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/06/4D5DB150-D6EE-4D6A-957E-BB904D4EB44C.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/06/3660B29A-E5D5-4E95-9198-FD4B777853F8.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/06/0CC96623-2FF5-4E88-AFA4-7EB0AF793865.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/9D1616D3-C92C-4CDF-BAFC-DCB4834C0837-e1658685207821-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/169CF14F-7E07-44B1-9D8B-6BAAAD184058-e1658685183284-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/150D4FE9-ED8B-4120-9641-F2CEC29F0701-e1658685151794-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/C31C3458-5EA5-4A09-B242-0B458FA1062A-e1658685001710-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/9B8797E4-A0BA-4AC0-A67E-659BEE7A8B29-e1658684972511-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/5F947CBC-5F2E-46E5-A033-BE447E604555-e1658684947245-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/21256D1C-5325-47C3-9DA1-DB94B20431D5-e1658684922293-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/E4B57186-158D-4D7E-AA73-CB2FE1BB205A-e1658684868852-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/5C35E8E7-2BCF-481B-8620-F86716D2A27E-e1658684896125-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/9BE4CA0B-163C-4159-A5F4-AE67C5F03A50-e1658684840925-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/3D9349E9-9C79-4C33-AEFA-5985F55A24A8-e1658684818170-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/75C0520D-E02F-4417-AE3F-E54C854FA041-e1658684791243-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/07/C33930F4-626E-4421-89AD-396E82FBDE1D-e1658701656277-540x722.jpeg?resize=540%2C722)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/06/7F385E27-7DC1-4082-9910-C3AEE011A862.jpeg?resize=540%2C720)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2022/04/3FED53D3-7FBD-4396-96DD-1BA8CE6776F1-540x720.jpeg?resize=540%2C720)
Leave a Reply