5-tube commercial radio (T1619E)

This commercial superheterodyne receiver was found in a 1949 Radio Electronics. The circuit uses battery.

BD42x LDO Regulators for Automotive and Industrial Use
June 2017 - The new ROHM Low Dropout Voltage Regulators (LDOs) for 3.3 V or 5.0 V high accuracy...
Pulse Width Linear Modulator (CB3987E)
This circuit is from an old Mullard (Philips) documentation on the 555. The circuit uses a pair of...
Simpson 250 Multimeter (CB1401E )
This was a very popular instrument in the workshops of the 60s and 70s. It was a "top of the line"...