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Timely because I decided to rebuild from scratch, so I will get a proper one. Will look on amazon. I hope I find the right one this time.
Hi folks.
I have changed my approach somewhat, partly because it is starting to get expensive screwing up and then having to buy more parts ;-)
I have started the circuit over from scratch. For those who are willing to continue to guide me, I thought I would post my step by step process in the hopes that you might check my progress before I get too far.
To make it easy, please refer to this schematic, which is the one I am working from:
https://www.electronicspoint.com/forums/threads/a-stretch.293212/
Here is what I have done so far. I would appreciate it if you could check the work. Hopefully, looking at the schematic, and reading the steps should make it easy to visualize what I have done by referring to the schematic.
5. One leg of C23 ( 470 nF Capacitor) has been connected to Pin 3 of the Op Amp socket (non-inverting input)
6. Placed C31 (100pF film capacitor on the PCB)
7. One leg of the C31 (100pF film capacitor) has been connected to Pin 2 of the op amp socket. (inverting input)
8. The other leg of the C31 (100pF film capacitor) has been connected to Pin 6 of the op amp socket. (output)
Thank-you!!!
P.S. Yes, it's me. Just decided to upload an avatar.
I have changed my approach somewhat, partly because it is starting to get expensive screwing up and then having to buy more parts ;-)
I have started the circuit over from scratch. For those who are willing to continue to guide me, I thought I would post my step by step process in the hopes that you might check my progress before I get too far.
To make it easy, please refer to this schematic, which is the one I am working from:
https://www.electronicspoint.com/forums/threads/a-stretch.293212/
Here is what I have done so far. I would appreciate it if you could check the work. Hopefully, looking at the schematic, and reading the steps should make it easy to visualize what I have done by referring to the schematic.
- Soldered R3 (10K resistor) on PCB.
- Connected one end of that resistor to C23 ( 470 nF Capacitor) . I used a film capacitor. The package it came in had the following label on it - CAP FILM RDL 0.47 UF 250V 15SL
- Connected R41 (1M resistor ) to one leg of the C23 ( 470 nF Capacitor). R41. Will run to the power part of this circuit, but for now, I left the other end for a later step.
- Soldered an 8 pin socket to the board, to house the Op Amp. The data sheet I am using for the TL081 op amp is here:
5. One leg of C23 ( 470 nF Capacitor) has been connected to Pin 3 of the Op Amp socket (non-inverting input)
6. Placed C31 (100pF film capacitor on the PCB)
7. One leg of the C31 (100pF film capacitor) has been connected to Pin 2 of the op amp socket. (inverting input)
8. The other leg of the C31 (100pF film capacitor) has been connected to Pin 6 of the op amp socket. (output)
Thank-you!!!
P.S. Yes, it's me. Just decided to upload an avatar.
Last edited:
- Joined
- Nov 17, 2011
- Messages
- 13,722
Following such a verbal description is difficult.
Here's how I proceed when breadboarding:
So far, so good.
I also usually start by making the Vcc and GND connections. Why? Because these have the most connections going to different components. It is (my personal opinion) easier to make these connections while the breadboard is not yet a mess of other wires.
Here's how I proceed when breadboarding:
- When you breadboard a circuit, make sure to have a hardcopy of the schematic on paper ready. And colored markers..
- With every connection you make, mark this one connection on the hardcopy (e.g. using a colored pencil). You may also want to number the connections sequentially, just in case. This latter step is not required.
- Once you think you are finished having made all connections, the hardcopy shall show no unmarked connection. If it does, you forgot to make this one.
- If during making connections you come across a connection that is already marked on the hardcopy, you have made an error. Check whether the supposedly existing connection is truly present. If so, the connection you are currently working on is wrong. If the marked connection is not present in the circuit, you obviously goofed when making the first mark. You then have to trace back your work (here's where the numbering during step 1 comes in handy) and identify the error.
So far, so good.
I also usually start by making the Vcc and GND connections. Why? Because these have the most connections going to different components. It is (my personal opinion) easier to make these connections while the breadboard is not yet a mess of other wires.
Thank you. I use the method you described, in that I have a highlighter that I colour all the connections I make with. The issue for me is not whether I have made a connection or left one out; it’s whether I have correctly interpreted how things connect to each other. That’s why I am telling like a step by step story, so that someone can easily say- hold on, you connected that wrongly.
- Joined
- Nov 17, 2011
- Messages
- 13,722
In that case you need to be more specific. For example:
and
Which ones? As I marked in the schematic hopefully the same one...
Hi Harald. Thanks for the feedback. I have edited my specification below, adding more detail in terms of which legs of the connectors I am using. Hopefully, that will provide sufficient clarity.
5. Right leg of C23 ( 470 nF Capacitor) has been connected to Pin 3 of the Op Amp socket (non-inverting input)
6. Placed C31 (100pF film capacitor on the PCB)
7. Left leg of the C31 (100pF film capacitor) has been connected to Pin 2 of the op amp socket. (inverting input)
8. Right leg of the C31 (100pF film capacitor) has been connected to Pin 6 of the op amp socket. (output)
- Soldered R3 (10K resistor) on PCB.
- Connected right side of that resistor to C23 ( 470 nF Capacitor) . I used a film capacitor. The package it came in had the following label on it - CAP FILM RDL 0.47 UF 250V 15SL
- Connected left leg R41 (1M resistor ) to right leg of the C23 ( 470 nF Capacitor). R41. Will run to the power part of this circuit, but for now, I left the other end (right leg) for a later step.
- Soldered an 8 pin socket to the board, to house the Op Amp. The data sheet I am using for the TL081 op amp is here:
5. Right leg of C23 ( 470 nF Capacitor) has been connected to Pin 3 of the Op Amp socket (non-inverting input)
6. Placed C31 (100pF film capacitor on the PCB)
7. Left leg of the C31 (100pF film capacitor) has been connected to Pin 2 of the op amp socket. (inverting input)
8. Right leg of the C31 (100pF film capacitor) has been connected to Pin 6 of the op amp socket. (output)
Here is my updated steps:
5. Right leg of C23 ( 470 nF Capacitor) has been connected to Pin 3 of the Op Amp socket (non-inverting input)
6. Placed C31 (100pF film capacitor on the PCB)
7. Left leg of the C31 (100pF film capacitor) has been connected to Pin 2 of the op amp socket. (inverting input)
8. Right leg of the C31 (100pF film capacitor) has been connected to Pin 6 of the op amp socket. (output)
9. Soldered D2 (1N4148) diode as follows: Left leg to left leg of C31 (100pF) Capacitor and right leg of D2 (1N4148) diode to the right leg of C31 (100pF) Capacitor. The little black stripe on the diode, is to the right.
10. Soldered D1 (1N4148) diode as follows: Left leg to left leg of D2 (1N4148) diode and right leg of D1 (1N4148) diode to the right leg of D2 (1N4148) diode. The little black stripe on the diode, is to the left.
11. I have ordered the correct 500K pot and it is expected to be here tomorrow, so i will continue then. In the interim, i would really appreciate it if the steps above can be reviewed so that i know i have not made any errors.
Thank-you!!!!!!
- Soldered R3 (10K resistor) on PCB.
- Connected right side of that resistor to C23 ( 470 nF Capacitor) . I used a film capacitor. The package it came in had the following label on it - CAP FILM RDL 0.47 UF 250V 15SL
- Connected left leg R41 (1M resistor ) to right leg of the C23 ( 470 nF Capacitor). R41. Will run to the power part of this circuit, but for now, I left the other end (right leg) for a later step.
- Soldered an 8 pin socket to the board, to house the Op Amp. The data sheet I am using for the TL081 op amp is here:
5. Right leg of C23 ( 470 nF Capacitor) has been connected to Pin 3 of the Op Amp socket (non-inverting input)
6. Placed C31 (100pF film capacitor on the PCB)
7. Left leg of the C31 (100pF film capacitor) has been connected to Pin 2 of the op amp socket. (inverting input)
8. Right leg of the C31 (100pF film capacitor) has been connected to Pin 6 of the op amp socket. (output)
9. Soldered D2 (1N4148) diode as follows: Left leg to left leg of C31 (100pF) Capacitor and right leg of D2 (1N4148) diode to the right leg of C31 (100pF) Capacitor. The little black stripe on the diode, is to the right.
10. Soldered D1 (1N4148) diode as follows: Left leg to left leg of D2 (1N4148) diode and right leg of D1 (1N4148) diode to the right leg of D2 (1N4148) diode. The little black stripe on the diode, is to the left.
11. I have ordered the correct 500K pot and it is expected to be here tomorrow, so i will continue then. In the interim, i would really appreciate it if the steps above can be reviewed so that i know i have not made any errors.
Thank-you!!!!!!
- Joined
- Nov 17, 2011
- Messages
- 13,722
At a first glance sounds good.
But: I'm sorry I do not have the time to follow these steps in detail. If you use the image from post #64 and mark the connections as per your descriptions you should be able to complete the circuit by yourself. I couldn't do more than add these markings anyway.
But: I'm sorry I do not have the time to follow these steps in detail. If you use the image from post #64 and mark the connections as per your descriptions you should be able to complete the circuit by yourself. I couldn't do more than add these markings anyway.
Hi: I will continue along, report my steps, if only for my own sake, and if I run into a specific issue, i will ask. Let's hope it works.
By the way, I tried to come up with a way to make easy for people to follow. I thought that if the narrative is read, and one looks at the schematic, it would take no time for an experienced person to note if I am off track. But perhaps this method works for me, but not for others. I apologize, I honestly thought it would be the simple way. Anyway, maybe I can report any questions if I come across them instead.
By the way, I tried to come up with a way to make easy for people to follow. I thought that if the narrative is read, and one looks at the schematic, it would take no time for an experienced person to note if I am off track. But perhaps this method works for me, but not for others. I apologize, I honestly thought it would be the simple way. Anyway, maybe I can report any questions if I come across them instead.
ok..I am pausing because I don't want to make a mistake:
On a previous thread, Bertus was kind enough to post the polarities of the capacitors in this circuit. It is here:
A Stretch
The person who designed this circuit, wrote to me a few days ago and said I should use film capacitors, except for the power section.
I am at the part where I am to solder C3, which is the 1uF capacitor. I have attached a pic of the circuit to make it easy (please ignore the hand drawn box...it was from a previous question I had) .
Given that C3 is marked with polarity, am I to use an electrolytic capacitor here rather than a film?
Thank-you
On a previous thread, Bertus was kind enough to post the polarities of the capacitors in this circuit. It is here:
A Stretch
The person who designed this circuit, wrote to me a few days ago and said I should use film capacitors, except for the power section.
I am at the part where I am to solder C3, which is the 1uF capacitor. I have attached a pic of the circuit to make it easy (please ignore the hand drawn box...it was from a previous question I had) .
Given that C3 is marked with polarity, am I to use an electrolytic capacitor here rather than a film?
Thank-you
Attachments
Great. Thanks
Hello,
@Nanren888 , I indeed indicated that if the capacitors are polarized, where the + should be:
@SparkyCal , Did you read the comment on the picture?
I have put a red marking around it now.
Bertus
@Nanren888 , I indeed indicated that if the capacitors are polarized, where the + should be:
@SparkyCal , Did you read the comment on the picture?
I have put a red marking around it now.
Bertus
Yes. That is and was clear. But I wanted to know whether it had to be a polarized one. Seems it doesn’t.
Non-polarized film capacitors are used for coupling signals in low distortion audio circuits.
But since you want distortion in this circuit then a polarized electrolytic capacitor connected backwards will make additional awesome distortion.
But since you want distortion in this circuit then a polarized electrolytic capacitor connected backwards will make additional awesome distortion.
ok...so I will connect it as shown in the original diagram...connected backwards. i hope you were not joking. Being. a newbie, I can't tell
AudioGuru- what i meant to say is that i don't know if you were being sarcastic or whether connecting a polarized electrolytic capacitor backwards, will really produce additional distortion. Can you clarify because, i am getting near the end of this circuit and don't want to blow up a capacitor .
Thanks1
Thanks1
Hello,
Just use the film capacitors that you have available.
No need to buy more components.
When an electrolitic capacitor is mounted the wrong way around, some kind of diode efect may happen.
This can have bad effects on the capacitor when the power is a lot, but not in low power audio circuits.
If you want to have more guitar effect circuits have a look at these pages :
https://www.montagar.com/~patj/gindex.htm
http://www.muzique.com/schem/index.html
Bertus
Just use the film capacitors that you have available.
No need to buy more components.
When an electrolitic capacitor is mounted the wrong way around, some kind of diode efect may happen.
This can have bad effects on the capacitor when the power is a lot, but not in low power audio circuits.
If you want to have more guitar effect circuits have a look at these pages :
https://www.montagar.com/~patj/gindex.htm
http://www.muzique.com/schem/index.html
Bertus
