Enclosure not stated · 1 knob
Apollo Treble Booster
Based on the Apollo Treble Booster
- Category
- Boost
- Controls
- Treble/Bass
- Price
- see vendor
From the vendor
A vintage single-transistor germanium booster (2SB175) with a 500K Treble/Bass pot that blends between a small 1800pF coupling cap and a larger 22nF path, so it can boost treble or the full range.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 11 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| R1 | 150K | 150k | read from the schematic by eye | |
| R2 | 10K | 10k | collector; read from the schematic by eye | |
| R3 | 80K | 80k | read from the schematic by eye | |
| R4 | 2K | 2k | emitter; read from the schematic by eye | |
| R5 | 390K | 390k | read from the schematic by eye | |
| Capacitors 4 | ||||
| C1 | 1.8n | 1.8n | 1800pF; read from the schematic by eye | |
| C2 | 22n | 22n | .022uF; read from the schematic by eye | |
| C3 | 30u | 30u | electrolytic; read from the schematic by eye | |
| C4 | 5u | 5u | output, electrolytic; read from the schematic by eye | |
| Transistors 1 | ||||
| Q1 | 2SB175 | 2SB175 | germanium PNP; read from the schematic by eye | |
| Potentiometers 1 | ||||
| Treble/Bass | 500K | 500k | Potentiometer | read from the schematic by eye |