Questions tagged [synthesizer]

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1answer
65 views

Difference between a frequency synthesizer and a frequency mixer

I have tried looking a couple different places but cannot find a concise explanation on the difference between a frequency synthesizer and a frequency mixer. My goal is to take a signal at 915 MHz and ...
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0answers
28 views

Connect multiple bipolar PSUs to one torroidal transformer with center tapped secondary winding

I'm currently starting my ventures into building a modular synthesizer in eurorack format and am currently using a single power supply like this with a 12V AC wall wart: Source: http://...
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1answer
60 views

Can I add a Sense connection to this power supply?

I have a synthesizer (Yamaha CS-50) and the power supply is broken. I don't know why but it always blows the fuse. I tried everything, changing components, testing the transformer, etc. The fault is ...
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0answers
26 views

Running an Arduino from a dual 12V power supply [duplicate]

I build a regulated dual +/-12V power supply with common GND myself as specified in http://musicfromouterspace.com/analogsynth_new/WALLWARTSUPPLY/WALLWARTSUPPLY.php. Now I would like to run an Arduino ...
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1answer
50 views

What is the “input” being fed into a Delta-Sigma Modulator in a Fractional-N PLL? Are bits needed for a specific resolution at the input or output?

I'm doing some reading into Fractional-N PLL design and I have a bit of conceptual confusion regarding a delta-sigma modulator used to toggle the modulus of a divider. If you're trying for a certain ...
1
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4answers
103 views

Is an MPU capable of equal quality digital synthesis as a dedicated DSP chip? [closed]

Is there any factor which would cause a modern microprocessor ( such as an ARM Cortex A/M ) to be inferior at performing digital synthesis compared with a dedicated DSP chip of comparable speed? At a ...
3
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0answers
82 views

Sawtooth VCO DC offset issues

[Apologies in advance for possible misuse of terminology. I don't have any formal education in EE and am mostly self taught, so I may be lacking in some fundamentals.] I am trying to design a discrete ...
1
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4answers
136 views

Audio output voltage range

I'm working on a synthesizer project and I'm confused on what the final audio output voltage should be. The idea is that I would send the audio to a speaker or headphone amplifier, so I don't have to ...
0
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1answer
64 views

Why 90VAC from a synth's chasis that uses 12VDC PSU?

I have Korg's Wavestate synth. https://www.korg.com/us/products/synthesizers/wavestate/ It uses 12VDC PSU with two prongs, hence it has no ground pin. My power outlet is 220VAC. When I connect the ...
1
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1answer
125 views

How will wire wound resistors affect the synth's sound?

I am soldering up Music from Outer Space: Noise Toaster synthesizer. The guy who designed it said that carbon resistors should be used ("The resistors should be carbon composition or carbon film&...
2
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3answers
110 views

FET Written Inside Comparator/Op-Amp Symbol

I'm in the process of importing a bunch of old schematics from a 70's era synthesizer into KiCAD. In the process I've come across a symbol that I can't make sense of. It looks like this: Does anyone ...
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0answers
44 views

PLL for Audio Frequency VCO using R divider

I'm attempting to design a PLL for an analog, audio frequency VCO, but I've run into a conceptual problem. I can't reasonably use a divider in the feedback path. My reference frequency would ...
0
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1answer
68 views

Power Line Decoupling in Eurorack

Can some please suggest if I am doing this right ? The intended circuit is to used with opamp (TL072) Have I understood the decoupling right ?
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0answers
112 views

Using an Audio Signal for a Control Voltage for an Analog Synthesizer

I have a Moog Sub 37 Analog Synthesizer and a Korg SV-1 keyboard. Can I take the audio out of either the line outs or headphone out of the Korg and plug it into the volume or filter Control Voltage (...
1
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1answer
363 views

Trying to make fuzz factory with CV inputs

I'm trying to construct some kind of fuzz factory modular from regular fuzz factory pedal. Circuit of the original pedal is pretty easy, but I've tried to add some VCAs based on LM13700. Honestly, I'...
21
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6answers
5k views

Where do overtones in a 555 generated square wave come from?

I have built a 555 oscillator and connected it to a speaker. Using an oscilloscope I adjusted the 555 to generate a 2.5kHz square wave. I then held a microphone up to the speaker and fed the input ...
1
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1answer
355 views

Analog exponential convert for MFOS VCO

I'm trying to understand the exponential converter in the MFOS VCO. Here is a link to the complete MFOS Noise Box synth schematic. http://musicfromouterspace.com/analogsynth_new/NOISETOASTER/...
3
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2answers
1k views

Grounding Vcc and Vee?

I recently started electronics as my hobby. I'm working on this v/oct modular synth and in the schematic that I was working on, it did not make sence to me when all the Vcc and Vee are connected to ...
50
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5answers
7k views

Why does music synthesizer built from chain of astable multivibrator circuits get “out-of-tune” after a few hours?

I built a prototype keyboard/sound synthesizer using a chain of 13 astable multivibrator circuits whose outputs are connected to an audio amplifier chip (LM386) and speaker, all powered off a 9V DC ...
4
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1answer
189 views

How can I get this circuit to “make noise”

I designed this noise generator circuit that uses a 1N514 Schottky diode with a VDB transistor amplifier(note: the upper VDB resistor is actually 15kOhm). Looking at the oscilloscope trace it seems to ...
0
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1answer
52 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 ...
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1answer
5k 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 ...
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3answers
2k 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
112 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 ...
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0answers
173 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
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3answers
974 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
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1answer
112 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 ...
1
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1answer
143 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 quite a few explanations online. Where I'm starting to get quite lost is the function of the two diodes ...
4
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2answers
526 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
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3answers
522 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
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1answer
948 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, ...
6
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3answers
1k 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
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1answer
536 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
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2answers
790 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
50 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?
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2answers
1k 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
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2answers
392 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 ...
2
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1answer
173 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
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2answers
98 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 ...
1
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1answer
531 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
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1answer
432 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
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1answer
176 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
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3answers
561 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
2k 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
153 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
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1answer
1k 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
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1answer
389 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 ...
1
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1answer
3k 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
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2answers
2k 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
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1answer
250 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. ...