METAL
LM3900 High-Gain Pedal
Made in USA
METAL – LM3900 High-Gain Pedal
2
Copyrights & Trademarks
Copyright Hagerman Amplification 2021. All rights reserved. No part of this document
may be photocopied, reproduced, or translated to another language without prior
written consent.
Disclaimer
The information contained in this document is subject to change without notice.
Hagerman Amplification shall not be liable for errors contained herein or for
consequential damages in connection with the furnishing, performance, or use of this
material.
Warranty
Hagerman Amplification warrants this product free of defects in materials and
workmanship for a period of 10 years (90 days tubes and footswitch). If you discover a
defect, Hagerman Amplification will, at its option, repair or replace the product at no
charge to you provided you return it during the warranty period, transportation charges
prepaid to Hagerman Amplification. This warranty does not apply if the product has
been damaged by negligence, accident, abuse or misuse or misapplication, has been
damaged because it has been improperly connected to other equipment or has been
modified without the express written permission of Hagerman Amplification. This
warranty is limited to the replacement or repair of this product and not to damage to
equipment of other manufacturers. Any applicable implied warranties, including
warranty of merchantability, are limited in duration to a period of the express warranty
as provided herein beginning with the original date of purchase and no warranties,
whether express or implied shall apply to the product thereafter. Under no
circumstances shall Hagerman Amplification be liable for any loss, direct, indirect,
incidental, special, or consequential damage arising out of or in connection with the use
of this product.
Hagerman Amplification
PO Box 61911
Honolulu, HI 96839
808-383-2704
www.hagamps.com
METAL – LM3900 High-Gain Pedal
3
Description
Metal is a high gain distortion / fuzz circuit based on the unusual LM3900 Norton
(current input) amplifier chip. This novel design will get you thrashing with heavy metal
tones and sustain, all while maintaining a low noise floor.
Specifications
Item Specification
Bypass True
Gain 40dB
Bandwidth 40Hz to 5kHz
Controls Level, Tone
Size 5.4” x 2.4” x 2.1”
Input Power 9V to 15V @ 1mA
J2
R10
47k
R11
100kB
C5
10nF
U1C
LM3900
+9V
R7
47k
C3
100nF
R9
1M
R8
1M5
+9V
C4
10nF
R12
47k
C6
100nF
U1A
LM3900
+9V
R13
1M5
R14
1M
R15
47k
C8
100nF
R16
100kB
J1
U1B
LM3900
+9V
R4
47k
C2
100nF
R6
1M
R3
1M
R5
1M5
+9V
C7
1nF
C1
100uF
D1
LED
S1
R2
10k
R1
100
VDC
+9V
C9
100nF
TONE
LEVEL
8
13 9
10
12
11
6
15
40Hz-5kHz
3mV
45k
6mA
+40dB
COPYRIGHT 2020 HAGAMPS.COM
/