Experimental content:

1. Observe the starting condition

(1) Settings $R_{\text{f}}<30\text{k}\mathrm{Î\copyright }$

$A_{\text{f}}<3$ , $\left|{\stackrel{̇}{A}}_{\text{f}}\stackrel{̇}{F}\right|<1$ Observe the output waveform, no waveform - no vibration.

(2) Design $R_{\text{f}}>30\text{k}\mathrm{Î\copyright }$

at this time, $A_{\text{f}}>3$ , $\left|{\stackrel{̇}{A}}_{\text{f}}\stackrel{̇}{F}\right|>1$ Observe the output waveform, there is a waveform - start-up;

Increase $R_{\text{f}}$ Observe the output waveform starting condition - the starting speed is fast, but the waveform is distorted.

in conclusion:

a. $\left|{\stackrel{̇}{A}}_{\text{f}}\stackrel{̇}{F}\right|<1$ , can't shake; $\left|{\stackrel{̇}{A}}_{\text{f}}\stackrel{̇}{F}\right|>1$ , can start vibration; start condition: $\left|{\stackrel{̇}{A}}_{\text{f}}\stackrel{̇}{F}\right|>1$ .

b. $\left|{\stackrel{̇}{A}}_{\text{f}}\stackrel{̇}{F}\right|$ The larger, the easier it is to start, the worse the waveform.

2. Improve the waveform

Connect VD ₁ and VD ₂ to increase the amplitude stabilization circuit and observe the output waveform – the distortion is reduced.

in conclusion:

Adding a diode stabilization circuit improves the waveform.

3. Measurement frequency

Measured value: period T = 12.99ms, frequency f = 76.98Hz

Calculated value: frequency $f=\frac{\text{1}}{\text{2}\mathrm{Ï€}\text{RC}}=\text{79}.\text{62Hz}$

Blank Patch Panel

Blank Patch Panel,1U 12 24 Port Blank Patch Panel,Keystone Patch Panel Blank

Chinasky Electronics Co., Ltd. , https://www.chinacctvproducts.com