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L5 PREAMP DRIVE CHANNEL

14

WIRING DIAGRAM

IN

-V

GND

+V NC OUT

PCB

IN

GND -V

+V

JACK GND

PWR

GND

JACK

OUT

IN

+V GND PCB

OUT

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Summary of Contents for Lab L5

Page 1: ...RSION Lab Series L5 Channel 2 A pedal adaptation of the second channel of the Lab Series L5 amplifier from the late 1970s often considered to be the best solid state amp ever designed Preamp overdrive...

Page 2: ...d multi pole fixed EQ called the Multifilter The drive channel of the L5 was most famously used by Ty Tabor on the first four Kings X albums BB King also used these amps but only the clean channel for...

Page 3: ...nvolved a 9VAC adapter and an AC voltage tripler This was then rectified to bipolar 19V DC and regulated down to 15V on each rail This solution used cheap and readily available parts and it has worked...

Page 4: ...tor 1 4W R8 27k Metal film resistor 1 4W R9 27k Metal film resistor 1 4W R10 18k Metal film resistor 1 4W R11 18k Metal film resistor 1 4W R12 18k Metal film resistor 1 4W R13 18k Metal film resistor...

Page 5: ...citor 7 2 x 5 5mm R47 10k Film capacitor 7 2 x 2 5mm R48 10k Film capacitor 7 2 x 2 5mm R49 47k Film capacitor 7 2 x 3 5mm R50 47k Electrolytic capacitor 5mm R51 10k Film capacitor 7 2 x 3 5mm R52 100...

Page 6: ...citor X7R C26 10n MLCC capacitor X7R C27 100uF Electrolytic capacitor 6 3mm C28 10uF Electrolytic capacitor 5mm C29 10uF Electrolytic capacitor 5mm C30 47uF Electrolytic capacitor 5mm Z1 1N4743A Zener...

Page 7: ...M 20k trimmer Trimmer 10 1 4 DIST TRIM 20k trimmer Trimmer 10 1 4 VOLUME 25kA 16mm pot right angle BASS 25kB 16mm pot right angle TREBLE 25kB 16mm pot right angle FREQUENCY 100kC dual 16mm dual pot ri...

Page 8: ...ues even if the supply voltage was slightly lower than 9V However operating on the extreme lower end of a spec is not ideal from an engineering standpoint so if we re going to point you to a specific...

Page 9: ...en time and they all do the same basic thing From here hook up a 3 5mm male to male headphone cable and turned up the phone or computer volume to maximum then set the frequency to 1kHz and the wave ty...

Page 10: ...080 s pin This extra resistor prevents the LED from staying on all the time which was the only side effect of substituting the LM13700 in place of the CA3080 Enclosure size This project was designed f...

Page 11: ...GND 10n 10n GND GND GND GND GND GND GND GND VA VA GND GND 100k VA 1N4743A GND DC_GND DC_GND 100uF DC_GND DC_GND 10uH 10uH 10uF 10uF 10uH 47uF GND 220k GND 22uF C9 C10 MID 1 2 3 2 3 1 IC3A 6 5 7 IC3B...

Page 12: ...size assumes the use of a 5mm LED bezel available from several parts suppliers Adjust size accordingly if using something different such as a 3mm bezel a plastic bezel or just a plain LED 0 1 2 CM 0...

Page 13: ...L5 PREAMP DRIVE CHANNEL 13 ENCLOSURE LAYOUT Enclosure is shown without jacks See next page for jack layout and wiring 1590BBS...

Page 14: ...L5 PREAMP DRIVE CHANNEL 14 WIRING DIAGRAM IN V GND V NC OUT PCB IN GND V V JACK GND PWR GND JACK OUT IN V GND PCB OUT...

Page 15: ...as suggestions based on the experience and opinions of others Projects may be used for commercial endeavors in any quantity unless specifically noted No attribution is necessary though a link back is...

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