sawtooth like signal generator 3 - 5 Hz
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- 著者: radioam232
タグ: 3-5 generator Hertz like motor NL11561 radioam232 sawtooth signal sounds
Trying to develop a sawtooth generator I found this schematic that perhaps is interesting for other viewers. The wave is not a pure sawtooth, but perhaps usable in an electronic application. Frequency can a little bit (not much!) be changed by changing the value of the capacitors going from...
effect of shielding an oscillator coil with tin plate
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- 著者: radioam232
タグ: amplitude frequency inductance iron metal NL11561 oscillation oscillator radioam232 shield shielding VFO
Last video about this fenomena. A small signal oscillator coil, ment for a radio VFO is shielded (almost) completely with tin plate (iron enclosure). You can see that the frequency of the VFO signal goes up and the amplitude goes down.
effect of sheet metal (tin plate) on a coil
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- 著者: radioam232
タグ: coil effect inductance iron metal muffle NL11561 radioam232 resonance
Effect of tin plate (cola can metal or something like that, iron like) on an oscillator coil. When the iron metal comes close to the coil it has an effect on the oscillator frequency. When you build a radio with an air antenna coil, this is something to count with. Do not mount the antenna...
principles of resonance
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- 著者: radioam232
タグ: frequency high inductance low NL11561 radioam232 resonance resonancy
Principles/laws of resonance in a tank circuit ( = coil with capacitor over it). More turns and/or more capacity over the coil = lower frequency. Less turns of the coil and/or less capacity over it = higher frequency. Raising the inductance of the coil by moving in a ferrite rod = lower...
LED burning on electromagnetic waves / resonance
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- 著者: radioam232
タグ: burning circuit coil electromagnetic energy factor free frequency LED NL11561 no oscillator radioam232 resonance tank tune tuning waves
This is continuation of the video "lamp burning on electromagnetic waves". Here I show a LED that burns on radio waves. Due to the fact that the impedance of the LED is much higher (compared to the filament of the lamp) and the receiving coil is less loaded it is clear to see that the circuit in...
lamp burning on electromagnetic waves
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- 著者: radioam232
タグ: electromagnetic energy free lamp NL11561 no radio radioam232 resonance transport waves
Lamp (christmas tree type) burning on electromagnetic waves, sent out by an oscillator of approx. 3 Watt. This is no magic and no free energy, it is normal radio technology and the effect of electromagnetic resonance/energy transport by radio waves.
low tech electronic construction
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- 著者: radioam232
タグ: amplifier brass construction electronic HAM low nails NL11561 plywood radio radioam232 soft tech
Way of constructing electronic schematics on plywood with brass nails. Advantages: no problems with parasitic capacities, "earth wire" always clear to see (so you can hold it under control, less risk of a double earth circuit that can create many problems -hum- and uncertain electronic fenomena...
how to build a simple digital frequency counter
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- 著者: radioam232
タグ: counter digital Euros for frequency IF NL11561 radioam232
Digital frequency counter made from a shortwave radio (7 Euro's) with a digital frequency display. Only point is that the readout frequency is 450 KHz (or so, depends on the IF frequency chosen by the manufacturer) lower then the real frequency, but you have a good indication of the frequency on...
how to erase a magnetic tape with a HF oscillator
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- 著者: radioam232
タグ: circuit erase frequency head high NL11561 oscillator radioam232 resonance sine tape wave
Circuit design used to erase a magnetic tape for instance in a cassette recorder or a reel to reel deck. A sine wave oscillator drives a 1 Watt amplifier, to the output of the amplifier an erase head (4-18 Ohm or so) is connected. Essence of the circuit is that the head comes in resonance (L-C...
all kinds of tape heads
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- 著者: radioam232
タグ: bandrecorder cassette erase head NL11561 radioam232 recorder tape
Several tape heads: video images, video sound, reel to reel deck, cassettedeck. Types: erase head and record/playback head. The erase head has a low impedance (for instance DC resistance = 4-16 Ohm) because a substantial high frequent current has to flow through the head coil to erase the...
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