Ham Radio Exam Prep
Current Ham Radio Test Pools
Technician License 2018-2022
Free Practice Test: Technician
General License 2019-2023
Free Practice Test: General
Amateur Extra License 2020-2024
Free Practice Test: Amateur Extra
Gallery
Resources
LIVE
Amateur Extra Class: 2020–2024
Today
Sections
E1: Commission's Rules
E2: Operating Procedures
E3: Radio Wave Propagation
E4: Amateur Practices
E5: Electrical Principles
E6: Circuit Components
E7: Practical Circuits
E8: Signals and Emissions
E9: Antennas and Transmission Lines
E0: Safety
Quick Index
Practice Test
Help support WaveTalkers using
Buy Me A Coffee!
Element 4
E7
E7A
E7A01
E7A01:
Which circuit is bistable?
An AND gate
An OR gate
A flip-flop
A bipolar amplifier
E7A01
E7A02
E7A03
E7A04
E7A05
E7A06
E7A07
E7A08
E7A09
E7A10
E7A11