Just wondered if anyone can tell me the reason that the Zener diode in the table below Fig.1 has the same value resistor for all the values of Zener's?
It seems to me that they have gone to the trouble of making a table for no good reason or is there an error somewhere, I mean whats the point of making an if then scenario when all the thens are the same?
R2 will discharge C1 all the way to ground (I know, it will never fully discharge) when the 12V supply is turned off. Without it, the last volt or so might take a while. Why that would matter is another question.
I would bet good money that's a typo, and it is supposed to be 800uA. 4 watts dissipation in an 8 pin dip? More like a 6-color smoke generator than a 6-tone sound generator.
As you said, the datasheet is wrong.
The IC is a low current Cmos one. Its output current is only 5mA and the dalington transistors amplify it to a peak current of 10V/8 ohms= 1.25A. The duty-cycle reduces the entire circuit's average current to 800mA.
The IC is a low current Cmos one. Its output current is only 5mA and the dalington transistors amplify it to a peak current of 10V/8 ohms= 1.25A. The duty-cycle reduces the entire circuit's average current to 800mA.
I would think that the value of the zener depends on the supply voltage. The chip is rated from 2 to 5 volts and the zener is part of a crude regulator, the lower values would be for lower supply voltages to lessen the effect of supply on frequency. Bit of a naff setup...