Enclosure not stated · 2 knobs
EHX PulsarVerified
Based on the Electro-Harmonix Pulsar· 4 other boards clone it
From the post
Here's the original '79 two knob version of the EHX Tremolo....
Here's a modded layout that may cure the reported LFO clock bleed. Note that the semi-transparent 47µ cap is there just as an example. You should probably try different values there to find out what works the best. Also the 470R resistor should be tweaked for perfect value. Both of these are there to tame the LFO clock from bleeding back to mixer opamp supply.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 26 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 right of centre, 30K x2 and 200K x2: printed clearly, unusual (E24) values
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×4 | 47K | 47k | read from the layout by eye | |
| ×2 | 30K | 30k | 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 | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 330K | 330k | read from the layout by eye | |
| ×1 | 1.1K | 1.1k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| Capacitors 8 | ||||
| ×2 | 470nF | 470n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 22nF | 22n | 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 | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | ? | ? | value not given; read from the layout by eye | |
| Transistors 1 | ||||
| ×3 | 2N5088 | 2N5088 | read from the layout by eye | |
| ICs 1 | ||||
| IC1 | TL071 | TL071 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Intensity | A100K | A100k | Potentiometer | read from the layout by eye |
| Speed | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Trem/Chop | SPDT on/on | SPDT ON/ON | 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
- Electro Harmonics Pulsar Tremolo Effects Layouts (blog)