Broadband Balanced Mixer MC1556G (CB14563E)

We found this circuit in Motorola's Linear Databook in 1990. The integrated circuit used is no longer common today.

M204 Audio Preamplifier (CB849E)
This is a general purpose pramplifier launched in Brazil by Philips in the years 70. The BC549 is...
Light Alarm (CB12603E)
This somewhat unusual configuration, mainly in the form of adjustment, is from a 1978 publication. The...
Photodiode amplifier (CB6862E)
Found in Linear Technology documentation from the 90s, this circuit uses an operational amplifier...