Enclosure not stated · 3 knobs
Electro Harmonix Hare LipVerified
Based on the Electro-Harmonix Hare Lip
- Category
- Vibrato / Chorus
- Build
- Vero· 17×14· 12 cuts, 3 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Electro Harmonix, Modulation, Tremolo
From the post
A forgotten and quite odd one from the early days of EHX. Despite being marketed as a "Microphone Echo" and having "Echo" as one of the labels for the controls, this is actually a tremolo circuit with some quirks. There is no "Depth" control as in most tremolo effects, instead there are the "Echo" control which adjust the output level for the LFO signal. "Volume" control adjust the clean signal. "Speed" adjust the LFO rate. The schematic is redrawn from a factory schematic dated 1972. Some odd resistor values but I'm pretty sure closest common value will work. Also, the transistors is the same as in Triangle/early Rams Head Big Muffs. They are quite hard to source and Hfe is all over the place. 2N2222's or 2N3904 might be good subs. Not much info on the web on this one but there is a short writeup HERE.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 25 rows
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Check before you build · 5 values the reader of this layout was not sure of
- R4 (column 2, rows K-N): no value on the part; legend says 10k in factory schematic, gutshots show 300ohm; 10K entered
- R8 (column 3, rows I-M): no value on the part; legend says 124k in factory schematic, gutshots show 120k; 124K entered
- Volume and Echo pots: legend says 'Probably 100k', unknown tapers
- 43K (column 6) and 430K (column 4): printed clearly, unusual value
- 120nF x3: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| ×2 | 68K | 68k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×2 | 200K | 200k | read from the layout by eye | |
| ×1 | 43K | 43k | read from the layout by eye | |
| ×1 | 430K | 430k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 330K | 330k | read from the layout by eye | |
| ×1 | 1.2M | 1.2M | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| R4 | 10K | 10k | 10k in factory schematic, gutshots shows 300ohm; read from the layout by eye | |
| R8 | 124K | 124k | 124k in factory schematic, gutshots shows 120k; read from the layout by eye | |
| Capacitors 4 | ||||
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×3 | 120nF | 120n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | 2N5133 | 2N5133 | Try NPN silicon, Hfe 100-800; read from the layout by eye | |
| Q2 | 2N5133 | 2N5133 | Try NPN silicon, Hfe 100-800; read from the layout by eye | |
| Q3 | 2N5133 | 2N5133 | Try NPN silicon, Hfe 100-800; read from the layout by eye | |
| Q4 | FS36999 | FS36999 | Try NPN silicon, Hfe 100-800; read from the layout by eye | |
| Potentiometers 3 | ||||
| Speed | 100K | 100k | Potentiometer | unknown taper; read from the layout by eye |
| Volume | 100K | 100k | Potentiometer | probably 100k, unknown taper; read from the layout by eye |
| Echo | 100K | 100k | Potentiometer | probably 100k, unknown taper; read from the layout by eye |