Flashing Lights Suite Electronic Production VC best DIY Production Suite

I built the Flashing Lights Suite Electronic Production VC best DIY Production Suite from eBay
Electronic components are:

1. 470 ohms resistor (2)
2. 10K ohm resistor (3)
3. 2.2K ohm resistor
4. 503 (50K ohm Trimpot Variable Resistor)
5. LEDs (32)
6. SPDT switch (2)
7. 8050 transistor (2)
8. 104 (0.1uF non electrolytic capacitor)
9. 1N4148 diodes (10)
10. 1uF 50V electrolytic capacitor
11. 555 timer
12. 74HC4017 decade counter

The complete circuit diagram is shown below

The 555 timer runs in astable mode as illustrated in the figure below.

From the figure above, the time of the high period (also called the charge period) is given by:
T1 = 0.7 (Ra + Rb)Ct
The time of the low period (discharge period) is given by
T2 – 0.7 * Rb * Ct
The total period is:
T = T1 + T2 = 0.7 (Ra + 2Rb) Ct
and the frequency is: