The 74HC14 pin numbers could be pin 1 on the left side (input) and pin 2 on
the right side (output). Make sure all other inverters in the chip have
their input pins connected to some part of the circuit (no input pins left
floating) The power supply pins are pin 8 ground and pin 14 V+. This circuit
has been improved by replacing the diodes with a PNP transistor (2N3906).
Base connected to V+, collector to pin 1 of the 74HC14 and the emitter to
the solarcell +. Add a resistor (about 100K) across the solarcell to switch
the cricket on at slightly lighter conditions. Cricket circuits could also
use a 74HC240 as shown below in SIMD1V2 .
> -----Original Message-----
> From: Scott McC [SMTP:s_19ner@...]
> Sent: Tuesday, September 26, 2000 5:16 PM
> To: email@example.com
> Subject: [beam] help please
> In this schematic what pins of the inverter are used?
> How can you tell?
> Can a 74hc240 be subed for the 74hc14?