This circuit was obtained in an Electronics World of 1968. The operational amplifiers ones are types of the time, no longer used today. The circuit responds from less than 20 Hz.
This amplifier was obtained in a Harris documentation from the 90s. The circuit is high speed with...
This circuit is suggested by Motorola and is based on the well-known 723, integrated voltage...
This low drift or offset circuit is from an 80's documentation. The configuration can be made with...