Hello, I have only basic knowledge of electronics from school etc, although interested, not enough to draw a circuit schematic more advanced than very basic.

I saw here that one can order circuits from jlcpcb but is there also a similar place to order the circuit drawings if one describes what I want it to do?

Anyone knows if jlcpcb can also make the drawing from description?

 

Hello,

I think they will not make a drawing from a desciption.
The ready made projects are likely projects uploaded by users of jlcpcb.

Bertus

 

Hello,

I think they will not make a drawing from a desciption.
The ready made projects are likely projects uploaded by users of jlcpcb.

Bertus

Thanks, any idea who could do schematics from description?

The circuit is not complex.

 

Thanks, any idea who could do schematics from description?

The circuit is not complex.

You would need to hire an engineering consultant to do the design and component selection. Then JLCPCP can fabricate boards. Those boards would need to be stuffed and soldered by a competent technician and returned to the engineering consultant for testing and evaluation. These services might be available for either a flat rate or an hourly one. It won't be cheap.

 

If the concept is not able to be captured as a circuit schematic then it is not ready to be produced as a printed circuit board. The big effort is always in the details, which are what the result consists of.
Many years of my career included starting with a clients concept and requirements and creating a functional system that included controls and a machine that provided functionality to implement the concept.

So you need to start with both your description and the concept, which then lead to the function. At that point you should be able to describe the circuit that will provide that function. Then after the circuit is created it is examined to optimize the intended function and assure that it actually works. That action will lead to an actual circuit that can be built.
So the process is not so very simple.

NONE of this is intended to be critical, but rather to show a path to success, finally getting an assembly that does what you want it to do.

 

If you can describe the circuit in enough detail for someone to draw the schematic, you can draw the schematic. There is nothing difficult or mysterious about schematics. They need only symbols for the components and lines connecting the terminals. The difference between a simple schematic and a complex one is only the number of components and connections.

 

The path from concept to final product can be outlined as follows:

Concept -> specifications -> design -> schematics -> board layout -> PCB fabrication - assembly ->
testing -> rinse -> repeat

Testing and iteration must be emphasized because quite often the specifications were poorly stated in the first place.
Testing will reveal many flaws at any step in the process.

Edit: I would add to that sequence: search and procurement of components.
You might discover that the component you had in mind is no longer available. The design has to be modified to work with a different component.

 

Thanks, any idea who could do schematics from description?

The circuit is not complex.

Tell us completely the idea you have in mind.
Follow this with engineering specifications, meaning, give numbers such as "200 mW output into 8 Ω speaker" instead of "not too loud".

 

@Elecocor Either use the free KiCad to produce the files for board production, or find someone that would do it for you.

 

This forum has in it's threads a lot of schematic diagrams, and certainly looking at them and reading the discussions is a way to learn. And it is free! My recollection about circuit schematics is that we got into them about the third session of the basic circuit theory class, because the circuit drawing is the basic language of electric circuits and electronics. It is how we read and write what others are thinking about.

 

Tell us completely the idea you have in mind.
Follow this with engineering specifications, meaning, give numbers such as "200 mW output into 8 Ω speaker" instead of "not too loud".

Well, I think this below clip from youtube says exactly what I would like. I think that is the best way for me to explain it due to my only basic electronics knowledge.

To get as near as possibly those "two beeps", whenever triggered by 24 volts of continous power.

https://youtube.com/clip/UgkxBXePfYfs9wSyIA_Ryf0HfRttKiseQ8ES

 

No problem.
A single MCU and a piezo transducer will do, plus a 5.1 V zener and some glue stuff.

 

Well, I think this below clip from youtube says exactly what I would like. I think that is the best way for me to explain it due to my only basic electronics knowledge.

To get as near as possibly those "two beeps", whenever triggered by 24 volts of continous power.

https://youtube.com/clip/UgkxBXePfYfs9wSyIA_Ryf0HfRttKiseQ8ES

Making two beeps (with or without the flashing lights) is trivial, but the devil is in the details.

What does it mean to be triggered by "continuous power"?

Do you mean that when power is applied that you immediately get two beeps and then nothing more until power is removed and reapplied?

Do you mean that the circuit is continuous powered (before, during, and after the beeps) and that it is triggered by a signal (coming from, say, a push button)?

Or something else?

The simplest way to do what you want will be to use a small, cheap microcontroller. But you have to learn how to program it (and a program like this would be a good learning project because it's so simple).

It can also be done with a couple of ICs, such as a 555 timer and a dual FF. There are a number of ways to approach it.

 

To refine your thinking, start with a description of what it does. Then refine that description to EXACTLY WHAT IT DOES, step by step.
For the "Two Beeps" concept. How loud of beeps, how long each beep, time between beeps, frequency during the beep, change in frequency during beep, and what sort of waveform??
After that come the details: desired package size, weight, and power requirements.
Then comes the design of the actual circuit, and after that, the physical arrangement of the selected components. THEN a PCB layout and assembly.

 

simplest solution is to use MCU. that allows you to change things (duration, number of pulses, frequency).
you can make this out of oscillators:

1. monostable that control overall duration from first to last moment sound is heard (ignore gap in the middle). this is used to run one cycle...
2. an astable that has period 1/3 of the monostable, this one will produce on-off-on modulation.
3. another astable that produces sound of correct frequency.
4. driver for speaker.

optionally you can replace items 2 and 3 by active buzzer (with built in electronics).

select oscillator type (BJT, OpAmp, 555,...) and speaker / driver.

perhaps you want to reduce part count and choose to use something like CD4093 instead of couple of 555s.

then you need to choose R1,C1 for monostable set to some 0.9sec so R1,C1 could be somewhere around 150k 4.7uF.
with R2,C2 set this a bit shorter say 180k, 1uF
R3,C3 will be the audible frequency, say 150k, 10nF.
R4 can be used to limit speaker current and volume.

those are just rough calculations and an idea, not tested. you could replace resistors with trimmer potentiometers (say 250k) to dial things in rather than calculating. have to run, but the goal is to get something like this:

note, there should be no speaker current unless making sound.

 

Hello,

@panic mode , you might want to reduce the voltage of 24 volts for your circuit, as stated in the request.

Bertus

 

Hello,

@panic mode , you might want to reduce the voltage of 24 volts for your circuit, as stated in the request.

Bertus

Thank all for the effort.

With continous power I mean that the beeper circuit should be triggered by 24 volt power which makes it beep twice and not again even if it still has power from the initial applying. My thought is that the triggering of power comes from a toggle switch (ON ) or an indicator light (from a sensor). After a while this power will either be switched of (toggle OFF) or the indicator light will loose its power due to that the sensor is getting below its trigger point.

Eventually a switch is turned on again or a sensor is triggering power and then the beeper circuits activate the two beeps again. Hope this explains how I am thinking.

When it comes to volume, frequency of the beeps and time in between beeps I think the video clip shows how I would like it, just like the clip.

 

simplest solution is to use MCU. that allows you to change things (duration, number of pulses, frequency).
you can make this out of oscillators:

1. monostable that control overall duration from first to last moment sound is heard (ignore gap in the middle). this is used to run one cycle...
2. an astable that has period 1/3 of the monostable, this one will produce on-off-on modulation.
3. another astable that produces sound of correct frequency.
4. driver for speaker.

optionally you can replace items 2 and 3 by active buzzer (with built in electronics).

select oscillator type (BJT, OpAmp, 555,...) and speaker / driver.

perhaps you want to reduce part count and choose to use something like CD4093 instead of couple of 555s.
View attachment 361666
then you need to choose R1,C1 for monostable set to some 0.9sec so R1,C1 could be somewhere around 150k 4.7uF.
with R2,C2 set this a bit shorter say 180k, 1uF
R3,C3 will be the audible frequency, say 150k, 10nF.
R4 can be used to limit speaker current and volume.

those are just rough calculations and an idea, not tested. you could replace resistors with trimmer potentiometers (say 250k) to dial things in rather than calculating. have to run, but the goal is to get something like this:
View attachment 361671
note, there should be no speaker current unless making sound.

Many Thanks!

 

Making two beeps (with or without the flashing lights) is trivial, but the devil is in the details.

What does it mean to be triggered by "continuous power"?

Do you mean that when power is applied that you immediately get two beeps and then nothing more until power is removed and reapplied?

Do you mean that the circuit is continuous powered (before, during, and after the beeps) and that it is triggered by a signal (coming from, say, a push button)?

Or something else?

The simplest way to do what you want will be to use a small, cheap microcontroller. But you have to learn how to program it (and a program like this would be a good learning project because it's so simple).

It can also be done with a couple of ICs, such as a 555 timer and a dual FF. There are a number of ways to approach it.

"Do you mean that when power is applied that you immediately get two beeps and then nothing more until power is removed and reapplied?"

Yes!

 

7805 can be used to derive 5V from 24V, add capacitors before and after. as mentioned, this circuit was not proposed as a solution, it is something that may be considered. if deemed suitable, few tweaks like adding regulator, choosing current limit for speaker etc. still need to be done though those should be trivial, or at least much less of a challenge.