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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by 1oskar

  1. 1

    1.5 Volt Tracking Transmitter

    Small tracking transmitters however is in use from tracking dogs Radio collars Like this topic start. OK this is professional device, but this transmitters are not too much complex than transmitters in topic. Receivers are expensive but not impossible to make. Also people use professional...
  2. 1

    Simple Telephone Central Project

    Simple English explanation. simple-telephone-central-project-santral Device is too complex for only one subscriber and Phone Switch Board. Yes one phone is subscriber and another is Switch Board. When subscriber pick up phone, buzzer start ringing and when Phone switch board pick up...
  3. 1

    1.5 Volt Tracking Transmitter

    Good question, no point to make tracking transmitter with no receiver for tracking.I think they must work together. I was posted transmitter for tracking , but I deal wit such this receivers and directional antenna , but I cannot open new tread, because I am new here. And I am amateur radio...
  4. 1

    Wireless Electric Detonator

    Igniter is e-match or squib (not same and not work same) Wireless standard use AES256 encryption schema(Army remote controls for machine gun use this one, but if Army still not sure that encryption is perfect safe how door bell or RC toy can be safe? And Made in P.R.C. or Taiwan ??) and...
  5. 1

    Wireless Electric Detonator

    How many people must be killed or serious injured before simple fact become clear. -firework and serious explosive are not same at all but incidentally can be triggered on same stupid way. -most even not commercial explosives are under control (law regulation, with reason) -rocket models and...
  6. 1

    Rescue Robot !!!

    Or visit this links **broken link removed** or **broken link removed** or **broken link removed** even Sd.Kfz.302 Only to drive this museum version require big pile money. No wonder why for example Talon cost too much:) Even low cost, expendable MARV (look like toy) still to much...
  7. 1

    1.5 Volt Tracking Transmitter

    Only for digital circuits and audio frequency usually I was use such this PCB, for high frequency only PCB or I was made or buy. RF circuits are not good on experimental PCB The experimental PCB not good for such this, and make own PCB is really cheap and easy and more fun. Frequency are...
  8. 1

    2cell NiMH Battery Charger

    I never guess why most people think that charge NiMH , NiCd , or even Li Ion battery are same like car (lead) battery? I was make some chargers for , ICOM handhold radio, for difference YAESU handhold radios, wild Taiwan brands, also for ALINCO 120 , and others. And I never make two identically...
  9. 1

    RF detector

    Like say audioguru I can add any local oscillator in receivers , synchrony oscillators from TV set and CRT monitors.(It is hard to write all interference source today) It is correct in any city. Simple RF probe cannot help(only make wrong image). PC have also RF and will be cause a wrong...
  10. 1

    remote controlled rf robot

    Last thing is how to deploy robot, main problem is how to communicate with robot. OSCAR satellite in low orbits are in use very short time + valid radio license for booth robot and control, on distance communication must be 2way . Geostationary satellite are too expensive , but there is are...
  11. 1

    1.5 Volt Tracking Transmitter

    Anyway going out 88-108 MHz range not good idea, first if simple oscillator run over 108 MHz this is violation of law(in USA violation FCC rules) 108-135 MHz are airplane frequency , 121.5 MHz are homing distress frequency. So if somebody live near airport and make a "trip out frequency"...
  12. 1

    1.5 Volt Tracking Transmitter

    Coil and capacitor (I am not invented this, schematic diagram is from professional device early 1960 ) need because oscillator work on 3 time higher frequency than crystal frequency. I do not know how type crystal (quality)was used in original wild animal tracking device 40-45 year before. But...
  13. 1

    Tactile sensors for a robotic hand - need help

    Not impossible task. Tactile sensor , maybe good idea is use piezoelectric sensor but to measure force between motor actuator and robotic arm griper. But good is deliver information , motor consumption compare on simple electronic to avoid mistake. And information processed in micro controller...
  14. 1

    remote controlled rf robot

    this is not easy task (ask NASA Mars exploration siteRover Sojourner) really mean serious. This robot must be also independent when is out the reach remote control. But for distance operation (when you cannot see robot) you need two way rf communication. If you can forget GSM network (I know...
  15. 1

    1.5 Volt Tracking Transmitter

    I do not need 30 miles , but for dog tracking up to 1 mile.(Using time difference of arriving signal, or pseudo Doppler) Do not worry I have amateur radio license and law say I can use frequency exactly determined by lay, power and modulation. So I need something with almost practically...
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