Enclosure not stated · 3 knobs
Valve Wizard Small TimeVerified
Based on the Valve Wizard Small Time
From the post
Here's Valve Wizard's take on the PT2399 delay. It's very similar to most PT2399 delays out there, with a dual op-amp providing input and output buffering. This was designed with the tails function and it uses Valve Wizard's usual J112 switching. Here's his original schematic and explanation of the circuit. You can also use a DPDT footswitch for bypassing, using one side to turn the delay on/off and the other for LED indication. I've included 2 extra pads on the PCB layout for this function. If going this route, don't populate the J112 along with the 1N4148 diode, 1k and 4.7k resistors, and 10µ capacitor round the J112.
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 25 rows
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Check before you build · 1 value the reader of this layout was not sure of
- JFET near the bottom left (rows Q-R): the populated board shows only G S D, the wiring diagram labels it J112
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×2 | 100Ω | 100 | read from the layout by eye | |
| ×4 | 1K | 1k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×11 | 10K | 10k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 10M | 10M | read from the layout by eye | |
| Capacitors 8 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 2.2nF | 2.2n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×9 | 100nF | 100n | read from the layout by eye | |
| ×6 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| ×1 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 1 | ||||
| ×1 | J112 | J112 | JFET, named on the wiring diagram only; read from the layout by eye | |
| ICs 3 | ||||
| ×1 | PT2399 | PT2399 | read from the layout by eye | |
| ×1 | TL072 | TL072 | read from the layout by eye | |
| ×1 | 78L05 | 78L05 | regulator; read from the layout by eye | |
| Potentiometers 3 | ||||
| Repeats | B10K | B10k | Potentiometer | read from the layout by eye |
| Delay | B50K | B50k | Potentiometer | read from the layout by eye |
| Mix | B10K | B10k | Potentiometer | read from the layout by eye |