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425634950_185916.jpg soroushs24
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soroushs24
The .. [ادامه متن . . .]
operation of this circuit is quite straightforward and can be used with other tuning indicator tubes in general. There’s an anode supply of 250 volts d.c., functioning also as a voltage source for the grid (current limited and stabilized to 24 volts, by means of a small Zener diode). A simple transistor amplifier in a common-emitter configuration, converts the input audio signal to a negative voltage swing between -4 to -20 volts, required for the control grid. You want to tune the trimpot so that there’s -20 volts with respect to ground at 0 decibels (maximum volume) of your audio input; and a maximum of 0 to -4 volts in silence. If you’re using a different magic eye tube, pay attention to the different pinout and perhaps use a slightly different anode (plate) resistor – the recommended values can be found in a particular datasheet of your tube. The screen can be held at full potential without current limiting, as no current flows from there. The anode supply voltage is not that c
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soroushs24
The .. [ادامه متن . . .]
operation of this circuit is quite straightforward and can be used with other tuning indicator tubes in general. There’s an anode supply of 250 volts d.c., functioning also as a voltage source for
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soroushs24
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soroushs24
fdgd.. [ادامه متن . . .]
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soroushs24
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soroushs24
Welc.. [ادامه متن . . .]
ome to توییت پرشیا :)
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