1590B · 2 knobs
ROG Condor V1.1
Based on the Run Off Groove Condor· 3 other boards clone it
- Category
- Preamp / Amp-in-a-box
- Price
- €7.65in stock
From the vendor
A faithful PCB build of Run Off Groove's Condor — the JFET-driven 4×10 Jensen P10R cabinet simulator. The DPDT mod toggle reshapes the bridged-T notch and HF roll-off to approximate a 4×12 Marshall response. For silent practice, direct recording, or feeding a PA. All credit for the circuit goes to runoffgroove.com . The Condor is a passive-style speaker cabinet simulator from Run Off Groove. It models the frequency response of a 4×10 cabinet loaded with Jensen P10R speakers — the warm, slightly woolly cab that defines a Tweed Bassman. With a single DPDT toggle the response shifts toward a 4×12 Marshall G12-style cab: the upper-mid notch moves down, the highs roll off harder, and the overall
Schematic
The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 37 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| R2 | 22k | 22k | R2/R3 = virtual ground divider; R11–R14 = Sallen-Key LP series resistors | |
| R3 | 22k | 22k | R2/R3 = virtual ground divider; R11–R14 = Sallen-Key LP series resistors | |
| R11 | 22k | 22k | R2/R3 = virtual ground divider; R11–R14 = Sallen-Key LP series resistors | |
| R12 | 22k | 22k | R2/R3 = virtual ground divider; R11–R14 = Sallen-Key LP series resistors | |
| R13 | 22k | 22k | R2/R3 = virtual ground divider; R11–R14 = Sallen-Key LP series resistors | |
| R14 | 22k | 22k | R2/R3 = virtual ground divider; R11–R14 = Sallen-Key LP series resistors | |
| R4 | 18k | 18k | R4 = input series resistor; R9 = gyrator feedback resistor | |
| R9 | 18k | 18k | R4 = input series resistor; R9 = gyrator feedback resistor | |
| R5 | 1M | 1M | JFET gate-to-ground bias resistor | |
| R6 | 100k | 100k | R6/R7 = bridged-T notch resistors; R8 = VR bias to notch network; R10 = VR bias for IC1B | |
| R7 | 100k | 100k | R6/R7 = bridged-T notch resistors; R8 = VR bias to notch network; R10 = VR bias for IC1B | |
| R8 | 100k | 100k | R6/R7 = bridged-T notch resistors; R8 = VR bias to notch network; R10 = VR bias for IC1B | |
| R10 | 100k | 100k | R6/R7 = bridged-T notch resistors; R8 = VR bias to notch network; R10 = VR bias for IC1B | |
| Capacitors 16 | ||||
| C1 | 47µF | 47u | +9V supply bulk decoupling — 16 V or 25 V rated, observe polarity | |
| C2 | 22µF | 22u | C2 = VR decouple; C3 = JFET source AC bypass; C13 = output AC-couple; C16 = input AC-couple. All 16 V or 25 V rated, observe polarity | |
| C3 | 22µF | 22u | C2 = VR decouple; C3 = JFET source AC bypass; C13 = output AC-couple; C16 = input AC-couple. All 16 V or 25 V rated, observe polarity | |
| C13 | 22µF | 22u | C2 = VR decouple; C3 = JFET source AC bypass; C13 = output AC-couple; C16 = input AC-couple. All 16 V or 25 V rated, observe polarity | |
| C16 | 22µF | 22u | C2 = VR decouple; C3 = JFET source AC bypass; C13 = output AC-couple; C16 = input AC-couple. All 16 V or 25 V rated, observe polarity | |
| C4 | 47n | 47n | C4 = AC-couple from JFET drain; C7/C8 = gyrator network around IC1B | |
| C7 | 47n | 47n | C4 = AC-couple from JFET drain; C7/C8 = gyrator network around IC1B | |
| C8 | 47n | 47n | C4 = AC-couple from JFET drain; C7/C8 = gyrator network around IC1B | |
| C5 | 1n | 1n | C5 = bridged-T bridge cap (stock); C10/C12 = Sallen-Key LP shunt caps | |
| C10 | 1n | 1n | C5 = bridged-T bridge cap (stock); C10/C12 = Sallen-Key LP shunt caps | |
| C12 | 1n | 1n | C5 = bridged-T bridge cap (stock); C10/C12 = Sallen-Key LP shunt caps | |
| C6 | 6n8 | 6.8n | Bridged-T shunt cap (stock voicing) | |
| C9 | 3n9 | 3.9n | Sallen-Key LP feedback caps 2n7 + 1n2 in parallel | |
| C11 | 3n9 | 3.9n | Sallen-Key LP feedback caps 2n7 + 1n2 in parallel | |
| C14 | 1n2 | 1.2n | Bridged-T bridge cap added in Marshall mode (parallels C5) | |
| C15 | 8n2 | 8.2n | Bridged-T shunt cap added in Marshall mode (parallels C6) | |
| Diodes 1 | ||||
| D1 | 1N4001 | 1N4001 | Reverse polarity protection — observe cathode band orientation | |
| Transistors 1 | ||||
| Q1 | 2N5457 | 2N5457 | N-channel JFET in TO-92, DSG pinout J201 (DSG) MPF102 (DSG) | |
| ICs 2 | ||||
| IC1 | TL072P | TL072P | Dual JFET-input op-amp TLC2272 (recording) JRC4580D OPA2134 | |
| IC2 | TL072P | TL072P | Dual JFET-input op-amp TLC2272 (recording) JRC4580D OPA2134 | |
| Potentiometers 2 | ||||
| GAIN | 1k B | B1k | 16 mm right-angle PCB-mount, B-taper (linear) | |
| VOL | 10k A | A10k | 16 mm right-angle PCB-mount, A-taper (logarithmic) | |
| Trimmers 1 | ||||
| TRIM1 | 25k | 25k | 6 mm multi-turn or single-turn trimmer for JFET drain bias 50k OK | |
| Switches 1 | ||||
| SW1 | DPDT | DPDT | Cabinet voicing toggle — wires to SW1A and SW1B pads on PCB | |
Other boards based on the Run Off Groove Condor
- Run Off Groove Condor Cab Sim Effects Layouts (blog)
- Cab Sim ROG Condor Fuzz Dog · 1590B · £27.60
- Runoffgroove Condor Cab Sim Tagboard Effects