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 3 years, 7 months ago by Guenther.
    • This reply was modified 3 years, 7 months ago by Michael. Reason: Changed font and size styling for easier reading