The ADC801 is not an easy component to obtain today, but the configuration is worth reference. The circuit is from National Semiconductor's Linear Applications Handbook.
This circuit can flash for up to 30 months using alkaline batteries as shown in the table next to the...
This circuit accurately monitors a 5 V TTL source. The circuit is from National Semiconductor's Linear...
The purpose of this circuit is to match two operational amplifiers that operate with different...