The use of field effect transistors in this circuit improves its performance. This configuration is from a 1975 circuit manual. The transistor can be any general-purpose FET such as MPF102 or BF245.
This sophisticated dynamic transistor tester was found in French documentation from 1981 but can...
This negative ion generator was found in a 90s Popular Electronics. The autotransformer can be an...
This common configuration is one of many that can be found in this section using the 555. The...