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Questions tagged [synthesizer]

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0
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1answer
41 views

Measuring Frequency Synthesizer specifications

I need to measure all the electrical specifications of the Frequency Synthesizer KSN-2346A+ from Mini Circuits that appears in this datasheet: https://www.minicircuits.com/pdfs/KSN-2346A+.pdf but the ...
0
votes
1answer
98 views

Can I change a capacitor with one with a higher capacitance?

Hi I have just joined after lurking a lot because I haven't found an answer that was specific enough for me. I have a Soviet synthesizer (TOM 1501) and it has some odd defects such as clicking noises ...
0
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3answers
130 views

Standard ways to make a variable low pass filter

I tried out a basic low pass filter on one of my analog synthesizers: simulate this circuit – Schematic created using CircuitLab and this seems to work. I was wondering how I can create a ...
0
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1answer
81 views

PCB key contact [closed]

Hi! anyone knows how to design a pcb like this in the photo with eagle? Someone has a guide to do it? I don't know how the resistor should be placed. It is basically a pcb for a synth, the key ...
0
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0answers
36 views

How to fix LFO sync by changing component values

I've built an LFO with a sync output for a modular synth project. The LFO circuit is based on http://www.electro-music.com/forum/topic-31166.html and the reset part I added into that one using https:/...
7
votes
3answers
601 views

Amplify a signal having a DC component without using an opamp

I am building a simple modular synthesizer. I would like to keep everything simple and prefer to use discrete components over integrated circuits. My goal is to improve my knowledge about electronics. ...
1
vote
1answer
78 views

Choosing Component Values for DCO Design

This is a sawtooth DCO, the comparator U1A resets the ramp at the desired frequency (thus controlling the frequency), and the voltage V7 applied to integrator U2A determines the rate of change of the ...
0
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0answers
40 views

wiring up 2 resistive touch plates without interference

I'm trying to make a music controller and want to use resistive touch plates. I've worked up the circuit as shown below, and it works fine, but I'm not able to figure out how to work up two of them to ...
1
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0answers
77 views

Function of diode in the following circuit schematic?

I feel that I have a semi-solid understanding of op-amps (and the circuit above) after reading the plethora of explanations online. Where I'm starting to get quite lost is the function of the two ...
4
votes
2answers
274 views

Can someone help me to find the right transformer for this power supply?

So my current project is building a replica of the ARP Pro Soloist synthesizer from the 70’s. The project is mostly going very smoothly, but I am having some issues with the power supply section of ...
3
votes
3answers
198 views

How to drive a speaker/microphone from a digital circuit?

I’m having a hard time understanding how to use speakers or microphones. My end game here is a sequencer I’m going to lay out what I think so that you guys can correct me and help me understand why ...
1
vote
1answer
347 views

Is it possible to replicate the Thomas Henry X-4046 circuit using the PLL_Virtual component in Multisim?

The part of the circuit I'm having trouble implementing is the transistor pair that are used to control the output frequency (going into pin 11 of the 4046). I have removed the Exp FM, Linear FM, ...
5
votes
3answers
314 views

Exponential amplifier thermal stabilisation

I am currently trying to build a DIY analog synthesizer. I've looked at a lot of different designs and I am quite stuck on understanding how some exponential amplifier designs work. In analog ...
1
vote
1answer
269 views

Correct note frequency for STM32 based MIDI synth

I have been playing about with the EasyMXPro for STM32 dev. board from Microelektronica. I am trying to create a simple monophonic wavetable synth using the DAC, playable via. a MIDI keyboard, however,...
-1
votes
2answers
463 views

What do I solder to a 3.5 mm jack to make sound come out of it? [closed]

I am trying to make a simple Atari punk console.i am new to electrical engineering. I am trying to figure out what to solder to each pin of the jack to make the finished product work.
-3
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2answers
47 views

2 outputs of clock synthesizer connected together [closed]

Can anyone explain what is the purpose of the following schematic? Why are outputs Y1 and Y3 connected together?
1
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2answers
512 views

Baby 10 step sequencer help!

I'm a beginner in electronics and am working on a Baby10 step sequencer for a project. It consists of a 555 timer for a clock signal, a CD4017 decade counter and 2 more 555s for an Atari Punk Console ...
0
votes
1answer
182 views

Need help with TI SN76489 Sound Chip

I'm working on a project which uses the Texas Instruments SN76489 integrated circuit, which was used to make sound in arcade games and Sega games from the 80's and 90's, I believe. I made a similar ...
1
vote
1answer
94 views

Midi input that doubles as gate voltage input

I'm building something that would benefit from a midi-clock input, but also a analog clock input. In order to save space, i'd like to use a mini-jack with an adapter for the midi cable (as seen in the ...
-2
votes
2answers
82 views

Trace was cut during a modification of synthesizer, how to repair [closed]

I received a Roland TB303 synth that has issues. When I opened it to see what the issue was, to my horror I found that a prior owner had seemingly cut a trace intentionally. How are these fixed? Is ...
0
votes
1answer
335 views

8 Ohm Speaker Gets Hot - Simple 555 Piano [closed]

I have built this circuit and nearly everything works fine. I replaced the piezo with a small 8 ohm speaker and put a potentiometer in, so I can control the volume. Unfortunately the speaker gets ...
0
votes
1answer
283 views

Is it possible to use a 558 quad-timer IC as a polyphonic synthesizer?

As the title suggests, After looking at the pinout of the 558 IC, I've noticed that there are multiple output pins for each oscillator, so I'm wondering if there's an easy way to mix all four signals ...
0
votes
1answer
112 views

Configuration of AC Voltage Source for Sawtooth Wave

I have a little problem with circuit configuration as you can see below. Every Voltage Source has configuration - 120V/10 kHz And 1,3,5,7,9 - 0 Deg, 2,4,6,8,10 - 180 Deg I need to change voltage on ...
1
vote
3answers
359 views

Control volume with a pot [closed]

I'm trying to build a small synth with two pots to control tone and volume, i got the tone one working but I'm not sure how to control the volume since I'm planing to send it to an amp and just ...
3
votes
3answers
1k views

How to sync clock frequency to a microcontroller

I'm building a project which uses old FM synthesis chips - the Yamaha YM2612, which was the sound-generation chip used in the Sega Genesis, and also the TI SN76489, which was also in the Sega. YM2612 ...
0
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2answers
117 views

What do these deprecated markings mean?

I found this Moog Prodigy synthesizer schematic that I'm trying to figure out how it works in order to learn more about how electronics work. What do the circled symbol at the top of the schematic ...
1
vote
1answer
773 views

Which microcontroller to use to control Yamaha YM2612 arpeggiator?

Okay guys, I searched the forum and didn't find anything relevant. Here it is: I am planning on building an arpeggiator project based on the Yamaha YM2612 IC which was the sound chip used in the ...
4
votes
1answer
330 views

What's wrong with this simple PCB design? (midi synth)

I am designing a simple synth with Arduino (just the Atmega IC) and it works fine. The only thing is this annoying clicks I barely hear constantly if I raise the volume somewhat. I had this problem ...
0
votes
1answer
2k views

Controlling a 555 squarewave oscillator synthesizer with CV sequencer

Something of a novice here (I have experience building signal processors/guitar effects from scratch but little else) and I've been meddling with the circuit below. It works, although I only have the ...
4
votes
2answers
1k views

Minimoog VCO analysis

The diagram shows part of the schematic for the late-model Minimoog VCO. In the circuit, Q7 and Q8 form a current sink, drawing a current through the collector of Q7 that is exponentially related to ...
2
votes
1answer
157 views

How to increase an output of opamp in this noise generator?

I'm working on a noise generator for my analog synthesizer and have problems with current design I built. As a noise source I use NPN-transistor in avalanche mode with only base and emitter connected. ...
23
votes
5answers
2k views

Resistor Mounted On Top of IC?

Recently, I've been working to repair a broken 1980 "Arp Solus" synthesizer that I acquired from a friend. I have, however, found myself confronted by an unfamiliar arrangement: some kind of resistor ...
2
votes
1answer
302 views

Controlling the current through a Diode Bridge VCF

I'm investigating different analog low pass filter circuits and came across this Yamaha patent which ingeniously utilizes a diode bridge as a variable resistor. It takes some reading but in short: ...
2
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2answers
2k views

Voltage Controlled Second Order Low Pass Filter

First time poster. Please be kind! I'm working on an analog synthesizer project and recently started looking at Voltage Controlled Filter designs. I've scoured the internet for a low pass ...
2
votes
2answers
636 views

Which reasons are behind analog synthesizers creating less “perfect” or “defined” waveforms, when compared to their digital counterparts?

While doing some tests for this music stack exchange question regarding differences in the waveforms of different synthesizers, I noticed that a digital synthesizer sawtooth waveform tends to look ...
0
votes
1answer
562 views

Bipolar power from unipolar supply, but accounting for DC offset

I've been researching this one during the past week. I've found lots of examples of split rails, but nothing which addresses my concerns. I'm creating a new circuit board for an existing cv/...
1
vote
1answer
745 views

How does digital patch memory work on an analog synthesizer?

Not an electrical engineer, but kicking around ideas for a polyphonic analog synth with digital memory, a simplified/modernized update of an older all-analog design. I've riffled through some of the ...
4
votes
2answers
5k views

How do I apply PWM signal to the primary side of a transformer to get synthesized sine wave at the secondary side?

I'm trying to obtain a sinusoidal signal (\$f_{sin}=50Hz\$) by using a ferrite transformer. I am going to apply a PWM signal at the primary side (\$100kHz\le f_{PWM}\le300kHz\$). I'm going to use one (...
2
votes
2answers
201 views

Synthesizer humming [closed]

I have a Synthesizer (quite old but working) which makes a humming noise when powered on (not through the audio output). I wonder if it is a major undertaking to fix this. Is this something that ...
1
vote
2answers
2k views

Is it possible to use half of a LM13600 instead of a CA3080?

I'm in need of a replacement for the CA3080 for my VCO that I would like to build. I have come across the LM13600 and was wondering if anyone knew if I could just use half of it and operate it without ...
2
votes
1answer
302 views

How do I add a tuning potentiometer to modify the incoming control voltage of an XR8038?

I have been working on designing an analog synth and have decided to use an XR8038 as my VCO. If I wanted to add a tuning modifier would this configuration I made be okay? P.S. Would I need to attach ...
1
vote
1answer
150 views

using a XR1071 as a LPF/HPF/VCA

In my continued quest to design a poly synth I have decided to use XR1071(http://www.cq-dx.ru/upload/pdf/X/XR-1071.PDF) but only the right audio channel. would this configuration work for my purpose (...
-1
votes
1answer
787 views

XR-2206 as a VCO for a synth

I was wondering if the XR-2206's pitch was controlled by It's Vcc or by it's RA? Im a little confused when it comes to how I would get the output from a keyboard(after it is changed to voltage) to ...
0
votes
1answer
245 views

Designing a polyphonic synth [closed]

I am currently designing a synth based on various designs online and modifying them(the vco). I am not sure what I'm going to use in between the MIDI and VCO. What parts/circuits would I need to add/...
0
votes
2answers
297 views

System verilog on Quartus synthesis issue

module blockingbad(input logic clk,a,b,c,output logic y); logic x; always_ff @(posedge clk) begin y=x|c; x=a&b; end endmodule For ...
12
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3answers
1k views

Why does digital equipment have more latency than analogue?

Is the explanation that the digital equipment takes longer to propagate? For instance, a software synthesis is very slow compared to a hardware synthesis.
0
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1answer
2k views

use of library files in verilog synthesis and decompile original rtl file

I am testing a tool for verilog synthesis.I need to test that tool by using a library file or a directory but i am unable to get any example for the same.I am very new to verilog. Can any one suggest ...
1
vote
1answer
376 views

Twin T circuit noisy

I've been fiddling with a twin-T percussion oscillator with success. It's built on a breadboard and it sounds exactly how it should sound (damped sine wave, big 808/909-kind of kicks). However it's ...
2
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2answers
645 views

Efficient way to get multiple Analogue voltages out of a microcontroller?

I've read in my research that most microcontrollers are not built with DAC outputs as they are expensive to include on silicon chips. Also applications that require analogue outputs typically need a ...
2
votes
1answer
3k views

Quartus II ignoring synthesis attribute noprune

There is a register in my design that I am using for debug purposes with zero fan-out. Since it isn't driving any logic, the synthesizer optimizes it away. However, as far as my knowledge goes, ...