+ - + - + - + - a b c d e f g h i j 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 25 26 27 28 24 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 25 26 27 28 24 29 30 a b c d e f g h i j Ruby Amp Here is runoffgroove’s ruby amp: simple practice amp based on the 386 amplifier chip. runoffgroove took the datasheet example for the LM386, added a buffer in front, and tweaked a few values to come up with probably the most popular DIY practice amp. Check out the Noisy Cricket and Cigarette amp beavis board projects for similar circuits. Learn more about the ruby at http://www.runoffgroove.com/ruby.html beavis board project 3.9KΩ Hooking up a Speaker This circuit is designed to power an 8 ohm speaker, but will also work on 4 ohms or 16 ohms. Because the power output is so low (on the order of 500mW) you can hook it up to just about any type of speaker without worry about damaging anything. Using a Guitar Cab The amp sounds best hooked up to a guitar speaker, so if you have a speaker cab, hook it up there. Simply run a ¼” mono cable between the i/o breakout box’s output jack and the input jack on your cab. Using a Small Speaker If you have a small speaker, you can connect it either directly to the breadboard, or if the speaker’s wires are too big, use the terminal strip on the main board. Run one wire from ground on the breadboard to one of the terminal strips. Run the output wire from the breadboard to another screw on the terminal strip and connect it as shown below: breadboard output ground - + MPF102 d g s 1.5MΩ 47nF B10K Volume LM386 B1K Gain 100nf in out 47nf 10Ω 10uf + input Q1 MPF102 R1 1.5MΩ R2 3.9KΩ C1 47 nF 9 volts + G D S C6 220uF 6 Output VR1 B10K (Volume) 2 3 1 8 5 4 + - U1 LM386 7 C4 100 nF VR3 B1K (Gain) R3 10Ω C7 47 nF revision: 1.0 ● 28 may 2008 ● © 2008 beavis audio research
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30a b c d e f g h i j
Ruby Amp
Here is runoffgroove’s ruby amp: simple practice amp based on the 386
amplifier chip. runoffgroove took the datasheet example for the LM386,
added a buffer in front, and tweaked a few values to come up with
probably the most popular DIY practice amp. Check out the Noisy Cricket
and Cigarette amp beavis board projects for similar circuits. Learn more
about the ruby at http://www.runoffgroove.com/ruby.html
beavis board project
3.9KΩ
Hooking up a SpeakerThis circuit is designed to power an 8 ohm speaker, but will also work on 4 ohms or 16 ohms.
Because the power output is so low (on the order of 500mW) you can hook it up to just about
any type of speaker without worry about damaging anything.
Using a Guitar Cab
The amp sounds best hooked up to a guitar speaker, so if you have a speaker cab, hook it up
there. Simply run a ¼” mono cable between the i/o breakout box’s output jack and the input
jack on your cab.
Using a Small Speaker
If you have a small speaker, you can connect it either directly to the breadboard, or if the
speaker’s wires are too big, use the terminal strip on the main board. Run one wire from
ground on the breadboard to one of the terminal strips. Run the output wire from the
breadboard to another screw on the terminal strip and connect it as shown below:
breadboard
outputground
-
+
MP
F102
d
g
s
1.5MΩ
47nF
B10K
Volume
LM
386
B1K
Gain
100nf
in
out
47nf
10Ω
10u
f+
input
Q1
MPF102
R11.5MΩ
R23.9KΩ
C1
47 nF
9 volts +
G
D
S C6
220uF
6
OutputVR1
B10K
(Volume)
2
3
18
5
4
+
-U1
LM386
7
C4
100 nF
VR3
B1K
(Gain)
R310Ω
C7
47 nF
revision: 1.0 28 may 2008 © 2008 beavis audio research
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