I'm gathering parts for an IR remote control mini,mini go cart I fould in "Electronics Projects for Dummies" and I can't find all the parts.
Are there substitutes for:

1. an inverter SN74F04
2. an H-Bridge L293D

Or can I use any inverter or H-Bridge that fits my breadboard?

Also are 5v regulators LP2950 and LM7805 similar?

Thank You

 

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The 74F series was a high speed device but is no longer made. Probably a 74HCT04 would be a good substitute.

Without seeing the circuit or knowing what you intend to use instead of the L293D we cannot advise.

The LP2950 is a low drop-out regulator so it is not really interchangeable with the LM7805. The LM7805 would probably work with fresh batteries but it will give you a very short battery life as the battery voltage falls below the regulator drop-out voltage.

 

As I read the instructions, both the inverter (SN74F04) and he H-Bridge (L293D) are needed to rverse the rotation of the go cart wheels.
The 5v. regulators are used one in the transmitter, the other in the receiver to reduce the battery voltage from 6v to 5v max to protect the encoder & decoder.