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Each input is configured to detect a voltage over approx. 2 volts. When this voltage is reached, a logic HIGH is presented to the corresponding gate input. The output will react to what is present at the inputs, and the result, depending on the gate chip used, is buffered by the emitter follower, and used to drive the LED and output jack.
{| class="wikitable" style="display: inline-table;"
▲|+ Truth tables for the different logic gates that can be used in this circuit
! colspan="3" align=center|4001
|-
! colspan="3" align=center|NOR
|-
| IN a||IN b||OUT
|-
| 0||0||1
|-
| 0||1||0
|-
| 1||0||0
|-
| 1||1||0
|}
{| class="wikitable" style="display: inline-table;"
! colspan="3" align=center|4011, 4093
|-
! colspan="3" align=center|NAND
|-
| IN a||IN b||OUT
|-
| 0||0||1
|-
| 0||1||1
|-
| 1||0||1
|-
| 1||1||0
|}
{| class="wikitable" style="display: inline-table;"
! colspan="3" align=center|4071
|-
! colspan="3" align=center|OR
|-
| IN a||IN b||OUT
|-
| 0||0||0
|-
| 0||1||1
|-
| 1||0||1
|-
| 1||1||1
|}
{| class="wikitable" style="display: inline-table;"
! colspan="3" align=center|4081
|-
! colspan="3" align=center|AND
|-
|IN a||IN b||OUT
|-
| 0||0||0
|-
| 0||1||0
|-
| 1||0||0
|-
| 1||1||1
|}
{| class="wikitable" style="display: inline-table;"
! colspan="3" align=center|4030, 4070
|-
! colspan="3" align=center|XOR
|-
|IN a||IN b||OUT
|-
| 0||0||0
|-
| 0||1||1
|-
| 1||0||1
|-
| 1||1||0
|}
Line 100 ⟶ 159:
* A 10 to 22 ohm resistor can be used instead of the Ferrite bead. If you don't care about power-rail noise, just use a link instead.
* PCB 6" x 1" with 3mm mounting holes 0.15" in from the edges.
== CC-BY-NC ==
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
== See also ==
Line 107 ⟶ 169:
== References ==
* ''[https://web.archive.org/web/
== External links ==
* [http://bompiler.com/pcb/cgs39 CGS39 BOM] at BOMpiler
=== Suppliers ===
* [https://web.archive.org/web/20180625173521/http://www.elby-designs.com/webtek/
[[Category:CGS
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