A2 Circuits        Extras        Commonly Used Components

Subsystems may contain or be broken down into several smaller subsystems.
So these circuits can be treated as subsystems even if they contain several subsystems.

AS Circuits

Links to Circuits - Extras are not on the AQA specification.

Active

AS/A2

Active Switch

Bipolar | MOSFET

Y

AS

Amplifier (Op Amp)

Inverting | Non Inverting | Summing | Differential (Subtracting)

Y

AS

Astable Oscillator

555

Y

AS

Audio Power Amplifier

MOSFET Push Pull

Y

AS

Binary Counter

Binary Counter

Y

AS

Bistable

RS Flip Flop | D Type Flip Flop

Y

AS

Comparator

Comparator - Another One - LUX Change Detector

Y

AS

Digital to Analogue Converter

Summing DAC

Y

AS

Emitter Follower

Emitter Follower

Y

AS

Half Adder

Half Adder

Y

AS

Intercom

Intercom

Y

AS

Latch

RS Latch | D Type Flip Flop

Y

AS

LED Current Limiting

LED

N

AS

Monostable

555

Y

AS

Motor Drivers

MOSFET

Y

AS

Photodiode

Photodiode

N

AS

Potential Divider

Potential Divider

N

AS

Power Supplies / Rectifiers

Rectifiers

N

AS

Shift Register

Shift Register

Y

AS

Short Circuit

Short

N

AS

Source Follower

Source Follower

Y

AS

Switch

Mechanical
Bipolar Transistor
MOSFET
Relay
COM, NC, NO

N
Y
Y
N
N

AS
AS
AS
AS
AS

Voltage (Potential) Divider

Voltage Divider

N

AS

Voltage Follower

Voltage Follower

Y

AS

Volume Control

Pot

N

AS

Zener Diode Voltage Reference

Zener

N

AS

A2 Circuits

Links to Circuits - Extras are not on the AQA specification.

Active

AS/A2

Active Filters

Low Pass | High Pass

Y

A2

AM Demodulator

AM Demodulator

N

A2

Analogue to Digital Converter

Digital Ramp | Flash ADC

Y

A2

Attenuator

Attenuator

N

A2

Audio Power Amplifier

LM380
LM386

Y

A2
A2

Carrier Generator

Oscillator

Y

A2

Motor Drivers

H-Bridgs Sim
H-Bridge cct
PFM Speed Control

Y

A2
A2
A2

Multiplexer

Multiplexer

Y

A2

Passive RC Filters

Low Pass
High Pass

N

A2
A2

Sample and Hold

Sample and Hold

Y

A2

Schmitt Trigger

Schmitt Trigger Light | Schmitt Trigger Temp

Y

A2

Shaft Encoder

Shaft Encoder

N

A2

Tachometer

Tachometer

N

A2

Tristate Buffer / Driver

Tristate Buffer

Y

A2

Extras

Links to Circuits - Extras are not on the AQA specification.

Active

AS/A2

Astable Oscillator

Logic Gate
OP Amp
Crystal

Y

Extra
Extra
Extra

Darlington Pair

Darlington Driver

Y

Extra

Direct Conversion Superhet

Receiver based on the SA602AN

    

Double Balanced Mixer

Dalek Sound Effect

Y

Extra

Electret Microphone

Electret Microphone

N

Extra

FM VHF Transmitter

 Transmitter

Y

Extra

Infrared Transmitter / Receiver

IR TX and RX :: Pulse TX and RX

Y

Extra

JFET Microphone Preamp

JFET Preamp

Y

Extra

Monostable

Logic Gate
OP Amp

Y

Extra
Extra

Oscillator

Sine Wave

Y

Extra

Oscillator (Quartz Crystal)

Quartz Crystal

Y

Extra

Radio (MK484 Single Chip)

One Chip Radio Circuit

Y

Extra

Ring Modulator

Ring Modulator

N

Extra

Stabilised Power Supply

7805, 7812, 7912

Y

Extra

Tone Control

Baxandall

Y

Extra

Trigger Pulses

Trigger Pulses

N

Extra