• This topic has 5 replies, 3 voices, and was last updated 8 months ago by mwpeters75.
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    • #8836
    • #8837

      I love this Günther!  Very clever and great use of the Lectron System 🙂

      Please share more details about how you implemented the solenoid action for Herr Greger’s mouth.

      I would like to also embed this video elsewhere on Lectron.Info.  This is so cool!

      Thank you for your creativity!!


    • #8838

      Haaa, This is so cool !

      A clever use of the Lectron technology, This should have been used when he was still alive !

      Did you use a servo motor for the mouth ?


    • #8841

      The base for this circuit came from a proposal from around 1970 for a Morse Writer – if the speed was too high or you had no pencil and paper to write down the heard sequence. The schematic included an automatic start and stop of the transportmotor for the papertape. My until now not complete mechanical working prototype (not enough time…) looks like this:

      Please have a closer look at the top of the plotter pen: a simple relay (with removed contacts) presses down the pen and so the dots and/or dashes will be seen on the paper tape. On the photo the pen has still his plastic cap. After removing that cap the pen mechanicsm can be turned in an upright position and is ready for start…

      May be you receive following signal:   . _ . .     .     _ . _ .     _     . _ .      _ _ _     _ .  (what does it mean?)

      The input is a portable radio via a plug for headphones, volume control of the radio in mid position and up it goes!

      Here is a photo of the Greger construction with a similar relay, prepared for this action. To the left three different views of the same relay (5 V, 50 Ω). On the switching middle contact (=anchor) is soldered a short wire connected with the chin. Lips and “throat” (folded for the open/close action) are made from onesided red colored craft cardboard.

      The front view of this special block:


      …and the complete circuit:


      Please note the original Egger Lectron groundplate (blue frame, quality like a mirror!) from 1966.

      My first tries: using the Egger microphone block (like shown in GB patent 1,217,885 from 1967) with a 2-stage pre-amplifier and power output (LM386)  – but the total amplification was not high enough or resulted in oscillations… So I decided to go the proven way with headphone plug ( and to hear – and for video recording – parallel my on cassette recorded text with a serial 16Ω speaker module).

      I had to use a power supply, because the consumption with up t0 0.25 A and stable voltage is not possible with batteries. I had success with volume control (radio recorder as input) and voltage regulator between 6.5 and 8.5 V.




      • This reply was modified 8 months ago by Guenni75.
      • This reply was modified 8 months ago by Guenni75.
      • This reply was modified 8 months ago by Guenni75.
    • #8842

      Thank you for the details of your setup and morse writer.

      Aah, the morse code ! Michael told me once he was a radio ham amateur.

      He can surely translate this message !

      The morse writer seems a good construction, but could it be that the motor for the paper is too weak ? It seems such a small motor.

      Be aware that starting a motor consumes lots of power and the driver must be up this task.

      I like the construction of your setup, it’s a true piece of art. Well done !

      And what a shiny ground plate !

      Many greetings


      • This reply was modified 8 months ago by LectronFan.
      • #8844

        The morse code spells LECTRON!

        I am still a ham operator – WB2V.

        Thanks Guenther!

        • This reply was modified 8 months ago by mwpeters75.
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