Hello,
A long time ago, I had a magazine Nuts and Volts which contained an article which described the driving of a small engine with a thyristor.
This review is old of more than 20 years.
I lost the magazine which contained this article. The diagram was very simple and functioned very well.
How can i do for find this article ?
Thank you in advance.
Best regards,
dro.
I find an old article from Nuts and Volts
Hello Jwax,
Thank you for time that you want to grant well to my problem.
A very long time ago, I received this magazine from a friend. I do not buy it myself. it is then difficult for me to give the year of this article. but it is perhaps approximately 1977?
The article describes a very simple circuit to lead a small engine of DC (for small toys unless low tension 1A about 12V) with a thyristor and approximately 4 or 5 other components, a pot, some resistances, a condenser and perhaps a diac.
The pot was used for settle the speed of the engine.
Article's title , announce capacity to give the power to the engine at low speed. Or for start without jolt.
The characteristic for this time was to employ impulses to lead engine (PWM).
I suppose that the circuit is powered with CA.
I employed it for a small crane which I manufactured for a friend and it was perfect.
After several transformations in my house and a move, I cannot find my magazine
I am ready to buy all the collection between 1970 and 1980 to find this article!
Thank you and sorry for my bad English, I speak French.
Best regards,
dro.
Thank you for time that you want to grant well to my problem.
A very long time ago, I received this magazine from a friend. I do not buy it myself. it is then difficult for me to give the year of this article. but it is perhaps approximately 1977?
The article describes a very simple circuit to lead a small engine of DC (for small toys unless low tension 1A about 12V) with a thyristor and approximately 4 or 5 other components, a pot, some resistances, a condenser and perhaps a diac.
The pot was used for settle the speed of the engine.
Article's title , announce capacity to give the power to the engine at low speed. Or for start without jolt.
The characteristic for this time was to employ impulses to lead engine (PWM).
I suppose that the circuit is powered with CA.
I employed it for a small crane which I manufactured for a friend and it was perfect.
After several transformations in my house and a move, I cannot find my magazine
I am ready to buy all the collection between 1970 and 1980 to find this article!
Thank you and sorry for my bad English, I speak French.
Best regards,
dro.
I don't have that artical but I can suggest you try a simple web search using the terms "SCR DC motor speed control"
I found this page with several examples
http://www.educypedia.be/electronics/powermotor.htm
Fortunately, some of the links are in French. Take a look and see if one looks familiar.
Also search on "Chopper speed control" or "Chopper DC motor speed control"
An SCR (thyristor) is not the only way to do it. A DC speed control can be dome with BiPolar or FET transistors just as well. Although it sounds like the circuit you want also has a Soft Start feature.
I found this page with several examples
http://www.educypedia.be/electronics/powermotor.htm
Fortunately, some of the links are in French. Take a look and see if one looks familiar.
Also search on "Chopper speed control" or "Chopper DC motor speed control"
An SCR (thyristor) is not the only way to do it. A DC speed control can be dome with BiPolar or FET transistors just as well. Although it sounds like the circuit you want also has a Soft Start feature.
Thank you Haklesup,
I already found the link that you have transmitted to me but i not found an equivalent circuit with SCR. There is one with triac bud i don't know if i can use it with SCR.
I continue to find a equivalent circuit with max 4 or 5 components.
Best regards,
dro.
I already found the link that you have transmitted to me but i not found an equivalent circuit with SCR. There is one with triac bud i don't know if i can use it with SCR.
I already make my own MosFet H-Bridge driver for motors, controlled by a PIC with PWM and it is working well with smooth start and speed control but it is not as simple than the 'Nuts and Volts' one.An SCR (thyristor) is not the only way to do it. A DC speed control can be dome with BiPolar or FET transistors just as well. Although it sounds like the circuit you want also has a Soft Start feature.
I continue to find a equivalent circuit with max 4 or 5 components.
Best regards,
dro.
Hello Len,
I just read your answer because there was summer vacancy.
I appreciate very much your help. It is really wondefull.
I need to make a big effort for remind some think from the cover page.
The image in my mind is very blurred but i think that a title is speaking about a 'smooth motor starting' or 'power at slow speed' ?
Thank you very much.
dro.
I just read your answer because there was summer vacancy.
I appreciate very much your help. It is really wondefull.
I need to make a big effort for remind some think from the cover page.
The image in my mind is very blurred but i think that a title is speaking about a 'smooth motor starting' or 'power at slow speed' ?
Thank you very much.
dro.
Who is online
Users browsing this forum: No registered users and 3 guests