NPN
type
Transistor

Low Power
Electronic Switch to enable current to flow through the output(s)
.
Circuit Diagram
Component Table
Item
Values
TR1
Low power
Transistor
BC548B
£0.06 + VAT
R1
Fixed
Resistor
1K Ohm
£0.01 + VAT

Guide prices only
(+ VAT) .

 


Darlington
Pair

Sensitive
Electronic Switch to enable higher currents to flow through the output(s).
Circuit Diagram
Component Table
Item
Values
TR2
Darlington
Pair
BCX38B
£0.29 + VAT
R1
Fixed
Resistor
1K Ohm
£0.01 + VAT

Guide prices only
(+ VAT) .

 

.

Darlington
Pair

Buffer transistor to supply higher current to the output device(s).
Circuit Diagram
Component Table
Item
Values

TR
Darlington
Pair
(npn)

BCX38B
£0.29 + VAT

Guide prices only
(+ VAT) .

 

 

 

.

Thyristor
(SCR)

An Electronic Latch will remain switched on so current can continue to flow through the output(s) until it is reset.
Circuit Diagram
Component Table
Item
Values
SCR1
Medium Power Thyristor
2N5060
£0.19
+ VAT
R1
Fixed
Resistor
1K Ohm
£0.01
+ VAT

Guide prices only
(+ VAT) .

 

.

PIC

Re-Programmable
Microcontroller powered by 9 volt supply
Circuit Diagram
Component Table
Item
Values
IC1
PIC
Micro-controller
12F629 £0.83 + VAT
R5
Fixed
Resistor
1K Ohm
£0.01 + VAT

DIL
Sockets

8 Pin
£0.30 + VAT
Zn1
Zener Diode
5.1volt
(1.3 watt)
BZX85C5V1
£0.07 + VAT

Guide prices only
(+ VAT) .

 

.

PIC
Programmable Microcontrolle

(Powered by 9 volt d.c.)
Circuit Diagram
Component Table
Item
Values
IC1
PIC
Micro-controller
12F629 £0.83
12F675
£0.92
( + VAT)
Fixed
Resistor
1K Ohm
£0.01+VAT
R
Fixed
Resistor
330Ohm (I=12mA)
220Ohm (I=18mA)
£0.06 + VAT

8 pin skt DIL

£0.30 + VAT
Zn1
Zener Diode
5.1 volt (1.3 watt)
BZX85C5V1
£0.07 + VAT
Guide prices only (+ VAT)

.

Darlington
Pair +
Capacitor /
Resistor

Delaying the switching on of an output
Circuit Diagram
Component Table
Item
Values
C1
Radial
Electrolytic
Capacitor
1000uf = @ 1 min
2000uf = @ 2 min

1000uF
£0.12 + VAT
2200uF
£0.22 + VAT
R1
Fixed Resistor
1K Ohm
£0.01 +VAT

VR1
Variable Resistor

500K
£0.09 +VAT
Tr2
Darlington
Pair Transistor
BCX38B
£0.29 + VAT

Guide prices only
(+ VAT) .

 

.

Transistor
+ Capacitor

Temporary Latch
holding an output on
for a short time
Circuit Diagram
Component Table
Item
Values
C1
Radial
Electrolytic
Capacitor
100uf = @ 3 secs
220uf = @ 6 secs
100uF
£0.04 + VAT
220uF
£0.05 + VAT
R1
Fixed
Resistor
1K Ohm
£0.01 + VAT
Tr1
Transistor
BC548B
£0.06 + VAT

Guide prices only
(+ VAT)

 

.

Darlington
Pair +
Capacitor

Temporary Latch
holding an output on
for a chosen time
Circuit Diagram
Component Table
Item
Values
C1
Radial
Electrolytic
Capacitor

1000uF
£0.12 + VAT
100uF
£0.04 + VAT
220uF
£0.05 + VAT
2200uF
£0.22 + VAT

R1
Fixed
Resistor
1K Ohm
£0.01 + VAT
Tr2
Darlington
Pair
Transistor
BCX38B
£0.29 + VAT

Guide prices only
(+ VAT)