Web pages produced by D&T staff
	software  components developed by the D&T staff for use with programs such as  Crocodile Clip's or PCB Wizard
	tools

A number of potential alarm circuits based on the use of logic gates. These circuits can be opened directly if you have Crocodile Clips or saved to disk. The editing has initially been disabled. Some files contain text which must be removed if you intend to import the circuit into PCB Wizard.

By:    		S. Toms
Date:         	March 1999
Formats:      	.ckt Crocodile Clips (approx 4 kb each)
Files:         	Nand Gate Circuit No.1
		Nand Gate Circuit No.2
		Nand Gate Circuit No.3
		Nor Gate Circuit No.1
		Nor Gate Circuit No.2
		Nor Gate Circuit No.3
		Nor Gate Circuit No.4
		Not Gate Circuit No.1

A number of potential road safety circuits. These circuits can be opened directly if you have Crocodile Clips or saved to disk. The editing has initially been disabled. Some files contain text which must be removed if you intend to import the circuit into PCB Wizard.

By:    		S. Toms
Date:         	March 1999
Formats:      	.ckt Crocodile Clips (approx 4 kb each)
Files:         	LED Flasher circuit based on 555 Astable
		LED Flasher circuit based on nor gate Astable
		LED Flasher circuit based on nand gate Astable
		LED Flasher circuit based on not gate Astable
		LED Chaser  - 555 Astable and 4017 Decade Counter
		LED Chaser1 - 555 Astable and 4017 Decade Counter
		LED Chaser  - Astable and 4017 Decade Counter
		LED Chaser  - Astable and 4017 Decade Counter
		LED Chaser  - Astable and 4017 Decade Counter
		Flashing Light - Automatically lights at dusk
		Bicycle Indicator 
		Bicycle Indicator
		Reversing Circuit - Alternating buzzer and light
		Reversing Circuit - Increasing tone as LDR is illuminated
		Reversing Circuit - Alternating Buzzer and Light

A number of potential Quiz referee circuits. These circuits can be opened directly if you have Crocodile Clips or saved to disk. The editing has initially been disabled. Some files contain text which must be removed if you intend to import the circuit into PCB Wizard.

By:    		S. Toms
Date:         	March 1999
Formats:      	.ckt Crocodile Clips (approx 4 kb each)
Files:         	Quiz circuit based on Not Gates
		Quiz-2 Circuit based on NPN transistors
		Quiz-3 Similar circuit using thyristors to latch signal
		Quiz-Nor Basically an SR flip flop from Nor gates 
		Qz-Nor1 Similar circuit using thyristors as well
 	        Qz-Nor2 As above but with NPN outputs to drive bulbs
		Qz-Nor3 As above but with audible output

A number of potential charity games circuits. These circuits can be opened directly if you have Crocodile Clips or saved to disk. The editing has initially been disabled. Some files contain text which must be removed if you intend to import the circuit into PCB Wizard.

By:    		S. Toms
Date:         	March 1999
Formats:      	.ckt Crocodile Clips (approx 4 kb each)
Files:         	s-hand1  simple steady hand circuits
		s-hand2  simple steady hand circuit using NPN and Relay
		s-hand3  circuit with count, latch and lives
		s-hand4  As above with limited lives only
		

Very clever graphic calculator, for identifying resistor values.

By:           Danny Goodman
Date:         March 17, 1997
Distribution: Freeware
Formats:      .htm (45 k)

calculator, for identifying resistor values.

By:           Doctronics http://www.doctronics.co.uk/
Date:         March 17, 1997
Distribution: Shareware
Formats:      .exe (209 k)

Calculator for ohm's law equations.

By:           Doctronics http://www.doctronics.co.uk/
Date:         March 17, 1997
Distribution: Shareware
Formats:      .exe (204 k)

Calculator for 555 resistor/capacitor network equations.

By:           Doctronics http://www.doctronics.co.uk/
Date:         March 17, 1997
Distribution: Shareware
Formats:      .exe (211 k)