Enclosure not stated · 2 knobs
Electro Harmonics Pulsar TremoloVerified
Based on the Electro-Harmonix Pulsar· 4 other boards clone it
From the post
Here's the original EHX Pulsar trem from the 70s (not to be confused with the modern Stereo Pulsar EHX manufactures today). It features Intensity and Speed controls as well as a switch to go between a hard and soft wavefrom. Original units often suffer from clock bleed from the LFO section. So I've drawn a second layout with mods to try and fix it. The 470Ω resistor above the IC and the 47µ cap below Q1 should be tweaked to find the values that work the best. Pots can be board mounted from the solder-side using right angle PCB pots.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 28 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 1.1K at column B rows C-F: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×1 | 1.1K | 1.1k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×4 | 47K | 47k | read from the layout by eye | |
| ×1 | 2M | 2M | read from the layout by eye | |
| ×1 | 330K | 330k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×2 | 30K | 30k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×2 | 200K | 200k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| Capacitors 8 | ||||
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×2 | 470nF | 470n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5088 | 2N5088 | 2N5088 or similar; read from the layout by eye | |
| Q2 | 2N5088 | 2N5088 | 2N5088 or similar; read from the layout by eye | |
| Q3 | 2N5088 | 2N5088 | 2N5088 or similar; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | TL071 | TL071 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Speed | A100K | A100k | Potentiometer | read from the layout by eye |
| Intensity | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Trem/Chop | SPDT | SPDT | toggle; read from the layout by eye | |
Other boards based on the Electro-Harmonix Pulsar
- Electro Harmonix Pulsar Dirtbox Layouts
- Electro Harmonix Pulsar - Big box version Dirtbox Layouts
- Jocelyn Bell Effects Layouts · 125B · $10.00
- EHX Pulsar Tagboard Effects