BACKGROUND INFO, LEGAL ASPECTS, CAREFULNESS ETC (things which are supposed to be understood and not repeated with each new elsketch project page) OVERVIEW OVER ONLINE AVAILABLE ELSKETCH PROJECTS -- -- THESE HAVE ALL BEEN CAREFULLY STUDIED IN REAL LIFE, NOT JUST AS AN EMULATION ON A COMPUTER, AND FOUND TO WORK AS PROMISED; NOTE THAT SUCH AS AM MW RADIOS IS -- FOR ANY LONG-RANGE USE -- EXTREMELY TIED UP TO ALL SORTS OF WEATHER CONDITIONS AND THE EXTENT TO WHICH IT IS NIGHTTIME ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ For the G15 Multiversity: Background works Also part of the Stamash Educational CenterS, SECS For general info about G15 Yoga6dorg see also In general terms, we might use the following vocabulary: Each Elsketch project constitutes also a report over successfully completed electronics development and implementation work, in a sense a bit of 'neopopperian research', intended to be replicated in an improvised, intuitive, playful way by anybody who likes to educate herself in this way. This report is dated September 4, 2013. For general info about copyright confer the spirit of honoring acknowledgements as found in our ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ Elsketch: Simple Intercom Buzzer -- A module with adjustable tone giving an intercom buzz type of sound as input to a premade audio amplifier [note: for ease of composing the materials, frequent mentions in the Elsketch texts are made of things which belong to the future -- future Elsketch activities include making even a whole G15 computer, and parallel activities are also referred to in the same manner, such as the chemical educational activity we have named Atomlite. apart from these references to things not yet done as if they have been done, each elsketch project describes a project actually carried out to success, and well tested, and fully doable in the present by following the instructions.] ICOMBUZ1: SIMPLE INTERCOM BUZZ OSCILLATOR MODULE BEFORE YOU BEGIN, MAKE THE STEEL GRID First, you make a steel grid as with the 1st radio module. The steel grid is normally more stable if you put the steel wires alternatively over and under one another as you construct it -- with a sense of 'knitting'. Tie up variously colored plastic-isolated thin steel wires (eg 0.6-0.7mm) of various lengths at suitable positions intuitively decided. COMPONENT LIST -- INTERCOM BUZZER OSCILLATOR MODULE *** one premade audio amplifier module with its own volume control, power supply, and loudspeaker, where there are two wires that goes to this -- one for ground, the other wire is main input mentally tagged: "amplifier" *** 12V power supply mentally tagged: "power supply" *** one NPN BC547C 45 volt or more transistor tagged: "osc-1a transistor" *** one NPN BC547C 45 volt or more transistor "osc-1b transistor" *** one 25k modulator (eg, twist four 100k in parallel) "osc-1a power" *** one up-to-30k adjustable modulator (eg, put three up-to-10k adjustable modulators in series) "osc-1b prepower" *** one 25k modulator "osc-1b power" *** one 46.9 nf capacitor "osc-1a c-pin" *** one 46.9 nf capacitor "osc-1b c-pin" *** one 50k modulator (eg, twist two 100k in parallel) "osc-1a m-pin" *** one 50k modulator "osc-1b m-pin" TINNING INSTRUCTIONS -- INTERCOM BUZZER Standard recommendations: Pls read comments after the tinning instructions BEFORE tinning. Take extra care with getting transistors and mf capacitors right. Switch power on only after looking at the elsketch very very carefully -- and then keep SAFE distance! This is your own responsibility. Don't do it if you're uncertain about the effects of doing this! Use much light & magnifiers. Regard names of sections of an elsketch as informal just like item tags. Check tinnings by pulling a little on them and when in doubt also check with an ohm-meter before power is on (after short-circuiting any mf capacitors connected). Remember that unless otherwise stated you can improvise freely as to just how you tin something to something else -- anywhere along a wire already tinned to one of them you can un-insulated by the tinner, say, -- it's not that you have to put more than one wire to each component. Don't overheat transistors and such -- a brief tinning to a wire, and let each cool before next tinning. If a twisted pair of modulators (say) seems not to be tight enough, it's best to tin them also. * Get the POWER SUPPLY wires and be sure of which wire is which, and get them tinned to suitable wires of different color with some length on the grid. * Tin GROUND WIRE of POWER SUPPLY to E-PIN of OSC-1A TRANSISTOR, and also to E-PIN of OSC-1B TRANSISTOR. * Tin MAIN WIRE from AMPLIFIER to C-PIN of OSC-1A TRANSISTOR, and GROUND WIRE from AMPLIFIER to E-PIN of OSC-1A TRANSISTOR. * Tin OSC-1A POWER MODULATOR to C-PIN of OSC-1A TRANSISTOR. Tin the other pin of this modulator to PLUS WIRE of POWER SUPPLY. * Tin OSC-1B PRE-POWER ADJUSTABLE MODULATOR (which can be three in series, if you have our standard type of 10k instead of one that is much bigger) to PLUS WIRE of POWER SUPPLY. Tin the other pin of the adjustable modulator to OSC-1B POWER MODULATOR. * Tin the other pin of OSC-1B POWER MODULATOR to C-PIN of OSC-1B TRANSISTOR. * The OSC-1A M-PIN modulator is tinned between M-PIN and E-PIN of OSC-1A TRANSISTOR. * Similarly, the OSC-1B M-PIN modulator is tinned between M-PIN and E-PIN of OSC-1B TRANSISTOR. * Finally, let's get the capacitors to do their holistic oscillation looping. Tin OSC-1A C-PIN capacitor to C-PIN of OSC-1A TRANSISTOR. The other pin of this capacitor goes to M-PIN of the other transistor, the OSC-1B TRANSISTOR. * And: Tin OSC-1B C-PIN capacitor to C-PIN of OSC-1B TRANSISTOR. The other pin of this capacitor goes to M-PIN of the other transistor, the OSC-1A TRANSISTOR. COMPONENT COMMENTS -- READ BEFORE TINNING AS FOR TRANSISTORS see the 1st AM MW radio description for C, M, E pins -- mentaly mnemonics for Collector, Middle pin, Emitter pin is "CoMe Easy!" -- and this is the sequence that the data work with the elsketch emulator on the PC has, it has C M E as 1 2 3. Transistors, CoMe Easy! AS FOR AUDIO AMPLIFIER The most sensitive input pin to the amplifier is the main wire, the other is the ground wire. The most sensitive input goes to the C-PIN of the relevant transistor. If in doubt which input wire is which, turn on the amplifier and with somewhat loud volume then touch each of the wires in turn, given that this is a safe low-voltage amplifier, of course. Tapping the main wire -- the copper or steel of it, with a very slightly damp finger, should lead to a tap in the loudspeaker while usually no corresponding sound should arise by tapping the ground wire. [[[Mountable data app for input to elsketch emulator in G15 comes as a link to a .zip here:]]] YOU HAVE TINNED IT -- NOW GET IT UP!!!!! Put the amplifier volume to the lowest possible and then a little up. If you have put it together right, it will be a remarkable buzz sound even on rather low volume. Switch on power supply with only one wire tinned to the elsketch (as usual the first time), and the amplifier. Keeping your normal distance (always check out security precautions eg as indicated in the main elsketch page) try put the other wire to and see if it works, but only after you've looked at the wiring and checked that nothing is short-circuited there. The sound is just right to get your assistants to connect to you, their boss, with a properly obedient attitude when you have clicked on your intercom. Its the type of buzz that instantly demands attention, but it isn't unpleasant when regulated to the right tone-height -- try adjusting the variable modulator or modulators -- and with properly low volume. HOW DOES IT WORK? The two capacitors -- some dozens of nanofarad are good to make an audio frequency sound, which typically are in the range of just some hertz and up to around twenty thousand hertz, or 20 khz -- they act together with each their transistor. We might put it like this: each capacitor plus transistor interacts with the other capacitor plus its transistor more or less as, in such as a radio, a single capacitor interacts with a single coil in the context of a transistor. So these two transistors are oscillator 1, part A, and oscillator 1, part B. They are both part of one single oscillator. So we tag them osc-1a and osc-1b. The cut'n'dried description goes roughly like this -- it is probably rather boring to read, but stuff like this has been written more lively elsewhere, so we allow ourselves to do it quickly here: One capacitor gradually lets through much then less and less as it gets filled up; as long as it lets through anything it acts to open -- also gradually -- the other transistor so as to empty the other capacitor. This emptying happens because the other transistor is connected to the C-PIN of the other transistor. When the other transistor is open, it lets through ground from E-PIN to C-PIN, and thus to the capacitor -- it gets grounded. But when the first capacitor is filled up, fully charged, it stops the other transistor from being open. This leads the positive charge at the C-PIN of the other transistor to start flowing through the second capacitor. But this flows acts so as to open the first transistor, and so ground -- and empty -- the first capacitor. Now one of the transistors have the output stuff for the amplifier at it. The other ones have the variable modulator or modulators at it. If we are making a different kind of tone with more balance between the various motions of the sound waves, we would want both transistors more equally handled as regards variable modulators. Let's also get it said that only in such low-power, non-urgent situations does it make sense to have smoothly gradual variable modulators -- in any high-watt situation, or any situation where it is very important to have a stable result over time -- it is better to have fixed steps and a switch that goes from one fixed set of modulators to the next. A variable modulator usually have something like a stretch of carbon on which a metal plate rests. This stretch of carbon typically will get dirty after a while and this will affect the tuning of it -- and it will also make tuning at a much later stage (many seasons later) likely to be a very noisy process. So in situation where a more certain result is called for, we use rather several fixed modulators and a switch of some kind. This approach can also with advantage be used where we could otherwise use a sliding variable capacitor. In our quantum-inspired philosophy, we should appreciate the value of fixed steps and not have everything floating -- so that 'good floats' can happen WITHIN a meaningfully created boundary of vibration, meaningful also psychologically and spiritually. The buzz sound is not only having a single frequency, but also a kind of underlaying deeper tone interposed on it, making it more a machine sound and less just any tone in the surroundings such as from a radio. Best of lucks! ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ BACKGROUND INFO, LEGAL ASPECTS, CAREFULNESS ETC (things which are supposed to be understood and not repeated with each new elsketch project page) ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________