Hagerman Audio Labs BUGLE3 User manual

BUGLE3
MM / MC Phonostage PCB
Made in USA

BUGLE3 Phonostage Kit PCB 2
Copyrights & Trademarks
 Copyright Hagerman Audio Labs 2023. 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 Audio Labs 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 Audio Labs warrants this product free of defects in materials and
workmanship for a period of 10 years. If you discover a defect, Hagerman Audio Labs
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 Audio Labs.
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 Audio Labs. This warranty is limited to the replacement or
repair of this product and not 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 Audio Labs 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 Audio Labs
1521 Alexander St Apt 1701
Honolulu HI 96822
808-383-2704
www.haglabs.com

BUGLE3 Phonostage Kit PCB 3
Description
Congratulations, you have just purchased one of the highest performance-per-dollar
audiophile products available! The Bugle3 was designed to be a simple yet flexible
phonostage capable of achieving very good sound quality, comparable to far more
costly units. It is a third-generation circuit topology using low noise audio opamps
implementing passive split-equalization filters, and a low output impedance. Loading
and gain are adjustable via DIP switches.
Available as a PCB-only kit! You must purchase all other components to complete
assembly.
Specifications
Item Specification
Loading 85, 100, 553, 47k Ohm
Gain 40, 50, 60, 64dB
Input Capacitance 26pF
Output Impedance 330 Ohm
Bandwidth 10Hz to 1000kHz
Distortion <0.01% @1kHz
RIAA Accuracy +/-0.5dB (30Hz to 30kHz)
Noise 82dBA ref 5mV

BUGLE3 Phonostage Kit PCB 4
Parts
The following parts (or similar) need to be purchased to complete your kit. If you want
to make substitutions, it is recommended to build as stock first to make sure things
work properly, then modify to your liking. Any LED will work fine. If you plan on using a
different case, buy panel-mounted RCA jacks, etc. Standard case is a SRA27B-N, but will
require drilling holes.
Item www.DigiKey.com Qty
RCA (red) CP-1419-ND 2
RCA (white) CP-1420-ND 2
Opamp 296-43962-5-ND 3
Splitter 296-6549-5-ND 1
LED 67-1072-ND 1
1mH M10005-ND 2
100nF 399-17918-ND 7
10nF 399-19851-ND 2
220nF 399-PHE426HB6220JR06-ND 4
220uF 16V 399-6566-ND 8
DC Jack EJ508A-ND 1
Socket ED3013-ND 3
DIP SW CKN9438-ND 6
47R5 47.5XBK-ND 4
100 100XBK-ND 6
332 332XBK-ND 4
562 562XBK-ND 6
1k30 1.30KXBK-ND 4
1k43 1.43KXBK-ND 8
4k75 4.74KXBK-ND 2
8k45 8.45KXBK-ND 2
13k0 13.0KXBK-ND 8
47k5 47.5KXBK-ND 4
470 1W 13-RSF100JB-73-470R-ND 2
Power Supply 1470-3172-ND 1

BUGLE3 Phonostage Kit PCB 5
Assembly
 Install all resistors, solder, cut leads.
 Install sockets, solder.
 Install DIP switches, with paddles facing inwards.
 Install 100nF decoupling capacitors.
 Install inductors.
 Install DC jack, rail-splitter, LED.
 Install inductors.
 Install RCA jacks.
 Install electrolytic capacitors.
 Install film capacitors (10nF, 220nF).
 Install opamps!

BUGLE3 Phonostage Kit PCB 6
Testing
Apply power to 24Vdc jack. Led should light up! If you have a DVM, check power supply
voltages on opamp pins 4 and 8. U1 should be powered by roughly +/-10V.
Loading & Gain
Switch Load Gain
0 47k 40dB
1 553 60dB
2 100 50dB
1 + 2 85 64dB
Troubleshooting
If audio quality is not good, double-check all resistor values to make sure they were
installed into correct locations.
If a channel has a scratchy sound to it (not a nice clean, quiet hiss) then it is likely the
input opamp has been damaged and should be replaced. These devices are very
sensitive to ESD and precautions must be taken. Hum, buzz, and other noise sources
(WiFi) can be induced into the Bugle2 and/or input cables. Place as far from other
equipment as possible.

VCC
VEE
J1
U1 TLE2426
L1 1mH L2 1mH
C2 220uF C3 220uF
C1 100nF
D2 LED R24 4k75 R25 4k75
R35 470 R36 470
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
1
2 3

U2* LM4562R1*
100
C9 220uF
C7 100nF
J2*
R3* 1.30k
R4* 13.0k
R5* 13.0k
R6* 1.43k C4* 220nF
U3* LM4562
R8* 1.30k
R9* 13.0k
R10* 8.45k
R11* 332 C5* 10nF
U4* LM4562
R13* 47.5k
R14* 1.43k
R15* 13.0k
R16* 332
J3*
C13 220uF
C11 100nF
C17 220uF
C15 100nF
R17 100
R19 47
R21 47 R22 47
R20 47
R18 100
C10 220uF
C14 220uF
C18 220uF
C8 100nF
C12 100nF
C16 100nF
VCC
VEE
C6* 220nF
R23* 47k
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
1
2 31
2 31
2 3
562
1.43k 562
100
1.43k 562