[LectronFanModerator]

Hi all,

When browsing through the comprehensive documentation on Lectron.info, my attention was attracted towards a circuit I found in an Inelco brochure.

The purpose or function is unknown to me. Can someone help here ?

There are lots of external connections.

I made a picture of this circuit, here it is :

Greetings

• This topic was modified 4 years, 7 months ago by Michael. Reason: Changed font and size styling for easier reading

[GuentherParticipant]

This circuit has a severe error, which kills the second transistor in the third flipflop, see here:

EDIT: the OR gate (middle) shoul be an AND gate (!)

This control section  is the middle part on a remote control car. Three parts are required: 1. Control Input (here: human voice), 2. Logic (here: above circuit for detecting the voice input and prepare the motor control), and 3. Motor Control (which motor should turn backward / forward / left / right).

Mr. Edzard Timmer developed this techniques and realized it in three different ways: a.  radio frequency, b. acoustic (voice) and c. optical (lamplight) in the years 1970…1972 as teaching material in his school. He was (50 years ago!) an absolute progressive and modern teacher with methods which will come 40…60 years later!

I had the opportunity to rebuild the vehicle with Mr. Timmer’s blocks, which original version was the eye catcher on Lectron exhibitions and inhouse demonstrations around 1972. Mr. Guerth had seen this “car” in Munich in the building of Deutsche Lectron GmbH (with Mr. Walter) and it was controlled by shouting words like “vor” / “zurück” / “links” / “rechts” . You may even call  1 / 2 / 3 / 4   or any arabic words, important is the number of words (or pulses) to reach the corresponding flipflop for the required motor action 🙂

Here is my vehicle replica, which run not exactly like the original one because of the rather loud motor noise 🙁  that had influence to the acoustic input (deck 1)

The three “levels”: signal input, logic (the mysterios circuit) and motor control for the Timmer acoustic version. all other versions here described in his manuscript for his school, which is now in the M.P.-Store. Even all the material, blocks etc. for this vehicle, so that Michael could build it again and let drive in his home  🙂

The input section:

The logic section:

The motor control section:

All these blocks above were from Mr. Timmers’ school – so a lot of history!

The original used motors were bigger ones with low noise, unfortunately not found among the “collection” in Mr. Timmers’ cellar. These three motors were used as follows: two motors left and right for backword / forward, and one motor in front for left / right. The complete model is heavy, so the motors and the wheels have a very hard job to do…

I had to change this to two motors with separate controls so that all moving could be done. Driving left means: only the right motor goes forward, etc.

…results into:

Hope that helps a little – questions wellcome!

Best, G.

 

• This reply was modified 4 years, 7 months ago by Guenther.
• This reply was modified 4 years, 7 months ago by Michael. Reason: Changed font and size styling for easier reading

[LectronFanModerator]

Wow Guenther !

This is a heck of a vehicle 😛

It’s great to see how clever minds can construct those circuits in the days without microcontrollers or motion controllers.

indeed, the T-block at the right in the photograph shorts the flip flop output.

I noticed also the use of an OR gate in the photograph. Your circuit uses an AND gate. It’s kind of hard to see though.

Thank you so much for your information, this is a cool example of using Lectron.

Greetings

• This reply was modified 4 years, 7 months ago by Michael. Reason: Changed font and size styling for easier reading

[GuentherParticipant]

Hi Frank,

thanks for looking – 4 eyes are better than 2 – the damned (wrong) OR gate I never noticed…

Here is the original Timmer version which I just found in my tons of Lectron images – this was my base:

and here the Timmer motor control (different to mine, see above reasons):

Yes, a fascinating example using Lectron, indeed. The used 9V blocks never worked for more then 5 minutes because of the huge current usage of all the circuits…

Best,

G.

• This reply was modified 4 years, 7 months ago by Michael. Reason: Changed font and size styling for easier reading

[MichaelKeymaster]

Fantastic history Guenther, thanks very much.  I will have to pull some of this information to supplement my pages!

[Author]

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