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181: Difference between revisions
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Each multivibrator is triggered by the output of the previous stage, and | Each multivibrator is triggered by the output of the previous stage, and | ||
cannot be triggered again for the duration of its pulse width. In the 181, | cannot be triggered again for the duration of its pulse width. In the 181, | ||
the pulse width ratio of one stage to the next is 1:10, i.e. when a stage triggers | |||
on a pulse at its input, it propagates that event to its output, but inhibits the next | |||
that event to its output, but inhibits the next nine pulses | nine pulses (by time, not by counting). | ||
not by counting | |||
The 181 also provides a 10 MHz output. This is generated by a 10 MHz resonator that | The 181 also provides a 10 MHz output. This is generated by a 10 MHz resonator that | ||
is driven by an amplified and waveshaped copy of the | is driven by an amplified and waveshaped copy of the 1 MHz crystal oscillator output. | ||
Since it is a harmonic, the 10 MHz output has same frequency | Since it is a harmonic, the 10 MHz output has same relative frequency accuracy as | ||
the reference oscillator. | the reference oscillator. | ||
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<gallery> | <gallery> | ||
File:Tek 181.jpg|181 | |||
File:Tek rm181.jpg|RM181 | |||
File:Tek co181.jpg|CO181 oven-stabilized oscillator | |||
File:Tek 181 block.png|Block diagram | |||
File:Tek 181 oscillator and multiplier.png|oscillator and multiplier | File:Tek 181 oscillator and multiplier.png|oscillator and multiplier | ||
File:Tek 181 frequency dividers.png|frequency dividers | File:Tek 181 frequency dividers.png|frequency dividers | ||