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Questions tagged [guitar-amplifier]

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0answers
27 views

Why is my signal stronger in the positive than in the negative when i use 2n3819?

simulate this circuit – Schematic created using CircuitLab In the above circuit I have created a JFET amplifier for small signal purposes. When I run tests on the circuit, i get this weird ...
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1answer
59 views

Valve guitar amp head with headphones only [closed]

I ordered Marshall DSL1HR valve guitar amplifier head. As you can see in specs it has built-in "Emulated line output". I know that a valve amplifier must be running with a speaker cabinet attached. ...
1
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1answer
41 views

Replacing elements in a tube amplifier

I assembled a tube amplifier.According to the specified scheme (Old Russian radio "Record 66"). 1.What is the function of capacitors C9 and C8 ? 2.What will change the capacity of these parts? Will ...
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2answers
38 views

Converting 2.1V RMS DAC output to instrument level 6.35mm jack

I'm not quite sure how level and impedance matching works so I am hoping for an illuminating answer! I'm generating audio with a PCM5102A DAC. The datasheet of the chip specifies a 2.1V RMS output ...
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1answer
24 views

Static noise when electric guitar plugged into amp

I have an Epiphone Wilshire that is producing a "static" sounding noise when plugged into an amp. I removed the cover plate and found a loose, black wire (ground?). It looks like the wire is connected ...
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1answer
84 views

How to find feedback resistor value?

I want to implement typical guitar preamp scheme, like following: I see, that it will have input impendance =2.2M...
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0answers
55 views

Portable Guitar Amp - Distortion, Volume & GND

I have tried following the given schematic There are 3 things I am unsure of (what I tried): The Volume 5k Potentiometer: I have tried adding a volume control to the schematic by placing the ...
4
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2answers
42 views

DIY guitar effect - delay

I'm trying to build a guitar delay effect based on this schematic: (https://i2.wp.com/cdn.makezine.com/uploads/2009/09/echobenderrev02.jpg) I designed and oredered a pcb : https://easyeda.com/...
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3answers
105 views

Guitar preamp problems

I built the following preamp to use with guitars Basically the idea is to keep it on a single rail so that I can use it off the same battery with this power amp https://www.eleccircuit.com/bridge-...
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0answers
101 views

Is ripple voltage is too high?

I'm trying to calculate voltage ripples on bulk capacitors of my guitar amp. Here's a schematic of it: simulate this circuit – Schematic created using CircuitLab According to formula Vpp=I/fC, ...
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1answer
262 views

Guitar signal with opamp boost

Hi just having some issues understanding what's happening with my opamp circuit. Vin is a Sine wave at 1kHz and VG is 4.5V. From what I understand this circuit should boost the signal I provide it ...
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1answer
48 views

Modifying guitar amp to run on batteries, switching between center tapped transformer and batteries with only DPDT switch

My situation is as follows: I'm trying to convert a small guitar amplifier to dual power. Mains and battery. The power supply that comes in the guitar amp is a center tapped 120V to 14V supply. After ...
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2answers
176 views

Thermal Management for Arcol HS50/HS100 50/100W Wirewound resistors

I'm designing a 100W dummy load for a guitar amplifier using Arcol HS50 and HS100 resistors. Here's a link to the datasheet: http://www.arcolresistors.com/wp-content/uploads/2014/03/HS-Datasheet.pdf ...
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1answer
264 views

What is simpliest possible guitar active preamp design

I want to build guitar active preamp inside my bass guitar. It has 2 humbacker pickups (3.4kOhm DC resistance each) for 2 lower and for 2 upper strings, and i want to preamplify each with a separate ...
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2answers
369 views

Potentiometer with SPST Switch Wiring With Bypass

I'm stumped on wiring a 10K Ohm audio control potentiometer with spst switch into a LM386 amplifier circuit. The pot I'm using is very similar to the one in this link: https://www.radioshack.com/...
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3answers
789 views

Capacitor Value in Bass amplifier to speaker circuit

Replacing electrolytics in a 30+ year old Ampeg BT-15 bass amplifier. The PS filter caps are \$ 2500 \mu F/80V\$ which are rare to be found; I know that 3300/100 would be okay for the filter. There's ...
2
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1answer
471 views

Using Audio Jack Switches as Paralell/Series toggle? (guitar amp and cabinets)

I have a guitar amp that has one output that can handle either an 8 or 16 Ohm load. I have a cabinet with two 8 ohm speakers (each with a separate input). I could wire the speakers in series, and get ...
4
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1answer
216 views

Need help reading a schematic, is this a 220k log b pot?

This is saying a 220k log b potentiometer for the tone pot VR8, correct? That is such an extremely odd value, but I don't see that sort of notation very often either and I wanted to make sure I'm not ...
3
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3answers
989 views

where to add gain and volume controls to LM386 guitar amp circuit?

Im trying to make a super simple guitar amp. heres the circuit using an LM386 operational amplifier: What exactly would affect gain but not volume, and volume but not gain? In the example circuit on ...
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1answer
85 views

Sound amplification

A few months ago I built myself a cigarbox guitar. I built all myself, including the pickup and I have wired it with a volume potentiometer and a jack output. It works well but I have to use a pedal ...
0
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1answer
162 views

Schmitt Trigger configuration for enabling power from guitar pickup

I would like to enable power to a regulator from a 1Vpp guitar pickup. Threshold can be between 0.2V and 1V. And I need it to disable after about 60 seconds of no signal from the pickups. I'm ...
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2answers
365 views

Female mono jack connector 6.3mm

I'm building a DIY pedal effect for my electric guitar and I have to connect the input and output jack connector, but I don't know how to do it. The connectors have 3 pins, one is the tip which it is ...
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2answers
103 views

Symbol for a potentiometer on a guitar amp layout diagram

Was working to convert a guitar amp layout diagram to schematic and stumbled upon this component. Looks like a potentiometer but has some additional tabs on the front. The label reads "master". Anyone ...
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2answers
334 views

How can I attach an analog to digital converter to a guitar

I want to modify an electric guitar to add an ADC and microcontroller to drive some LEDs for fancy effects that follow music. Since typical output levels of pickups are about 100mV, I was thinking of ...
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3answers
790 views

Need help adding gain overdrive/control to my tube guitar amp design

I'm new to analog electronics, so bear with me. Consider my guitar amp design: What we have is a 12AX7 feeding into a cathode follower, going into a James tonestack, through another 12AX7 gain phase, ...
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2answers
144 views

Guitar amplifier into load box

I own a Peavey Valve King 100 Amplifier and would like to hook this up to my audio card's line-in without blowing stuff up, so I thought I should get a loadbox with a built-in speaker simulator. I ...
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4answers
606 views

Tube Guitar amp Input Transformer Removal

for a few weeks I've been trying to remove the input transformer from my little 60's Magnatone amp. The schematic indicates a 1:3 step up input transformer, but from reading elsewhere on the internet ...
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2answers
3k views

Why do I need to “ground” my guitar pickup to the guitar bridge

When wiring my guitar pickup, I connected the ground wire to the ground of the output jack. After hooking that up, I would hear a hum unless I soldered a wire from the metal bridge of the guitar (...
1
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0answers
420 views

Replacing trim pots with potentiometers?

I have been looking at and considering building the following circuit from Beavis Audio Research. Their explanation of the circuit: Around 1965, Marshall introduced a few amps built around an 18 ...
1
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1answer
173 views

How To Eliminate Amplifier Squeal When PreAmp Power is Turned Off

I have a bass guitar that has a built-in pre amp, which is switched ON whenever the cable is plugged into the bass. I typically use the bass all day, and leave the amp on and the bass plugged in - ...
4
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2answers
983 views

Guitar picks up computer interference

Years ago I bought a computer case because my other one was getting too small for the components. After moving all of the parts and booting up, one of the first things I noticed was that my guitar ...
1
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1answer
401 views

Alter boost feature on Guitar Amp from a fixed +6 dB to variable +0 to +16 dB gain

I have an Ibanez TSA15H amp head. Here is the schematic for the boost portion of the amp. The Boost SW just goes to an Off(Open)/On(Gnd) switch. Currently the Boost is set at +6 dB. I would like ...
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2answers
710 views

How to read 1/4 audio jack data sheet?

I am trying to layout my own pcb for a guitar amp similar to but I am confused how the IN symbol that corresponds to the audio jack is supposed to be connected. Switchcraft Inc. RN112BPC I am ...
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5answers
823 views

When should an audio pre-amp use a differential input

As a guitarist, very familiar with the various types of noise that can wreak havoc with electric guitars, I've been mystified at how infrequently guitar amplifier inputs have employed differential ...