This chapter asked me to create the following astable multivibrator using the 555 IC. According to the datasheet I am using, my 555 IC is capable of operating at 2MHz.

I have constructed this exact thing many times so I am sure that I am following the book correctly. I've built it from that design and I've also built it by copying the example breadboard layout included.

According to the book I should get the following values:

C1 = 10uF,.....Frequency = 5.8Hz,......Voltage = ~0V

C1 = 1uF,.......Frequency = 58Hz,.......Voltage = ~0V

C1 = 100nF,....Frequency = 580Hz,.....Voltage = ~1.5V

C1 = 10nF,......Frequency = 5.8kHz,....Voltage = ~4V

C1 = 1nF,.......Frequency = 58kHz,......Voltage = ~4.2V

I am supposed to come to the following conclusions:

1. Above a certian frequency, the "Corner Frequency" the output signal is constant at it's maximum

2. At low frequencies the output is zero

3. Between these two sections the output signal varies in size depending on the applied input frequency

**MY DILEMMA:**

When I do the experiment myself I arrive with the following data:

C1 = 10uF,.....Frequency = 5.8Hz,......Voltage = ~0V

C1 = 1uF,.......Frequency = 58Hz,.......Voltage = ~0V

C1 = 100nF,....Frequency = 580Hz,.....Voltage = ~1.5V

C1 = 10nF,......Frequency = 5.8kHz,....Voltage = ~4V

C1 = 1nF,.......Frequency = 58kHz,......Voltage = ~1.6V

**I have been frustrated for 2 days trying to figure out what is the problem.**

I am using a new digital multimeter, I paid $40 at Radio Shack for it, It should be advanced enough to give me accurate readings.

I've tried 3 different 555 ICs from different manufacturers

I've checked my resistor values countless times and all my connections are correct.

I've used 2 different brands of 1nF capacitors (both ceramic) and get the same results.