Unknown components on this circuit board please help

[Daniel Barlow]

Hello I'm trying to recreate the circuit board and I'm having difficulty identifying the two 8 Pin IC's (they're the same) they have the number 7530 and looking it up i see some component come up that doesn't match what this circuit does-- as well as the round 3 pin object next to the 555 any help you can offer would be greatly appreciated thank you .

This circuit has a 4017 and a 555 and it simply makes some leds flash. what might be the function of the two 8 Pin IC's, and what is that weird component with the metallic center over to the left by the 555 timer?

Thank you,

Daniel

 

[(*steve*)]

My guess is that they are IRF7530, a dual N channel mosfet.

 

[Harald Kapp]

Could the 'weird component' be a pushbutton? It looks a bit dented.

 

[Somethingrandom]

The "weird" component looks like a potentiometer. I had similar pots in a metal detector circuit. Use a screwdriver to adjust. Take resistance readings before to reset it once you confirm.

 

[HellasTechn]

trimer variable resistor

The "weird" component looks like a potentiometer.

Correct, it is a trimmer (variable resistor).
I guess it is used to set the time constant of the 555. the 555 is in "free run mode" Though i am not 100% sure because i dont see the capacitor i would expect between pins 2 and 1 of the 555

 

[HellasTechn]

the 4017 is a decimal counter. the 555 is probably used to provide the pulses that the 4017 is counting.
the 7530 could be diode pack.

 

[AnalogKid]

Could be a trimpot, or, for longer flash rates, an electrolytic capacitor.

ak

 

[(*steve*)]

As stated above, the 7530 is a dual mosfet and is clearly used to control the 4 load outputs.

 

[HellasTechn]

Yes got that. I just read the Datasheet.