This equalizer has automatic level control, being designed by Sanyo for cassette recorders and radio. The maximum supply voltage of the LA3210 is 15 V and the typical idle current of 1.4mA.
This circuit generates various types of sounds and can be used as a toy. The circuit is from Radio...
The Buck-type DC-DC converter (voltage lowerer) shown in figure 11 is suggested by Analog Devices...
This circuit is from an American technical documentation from the 70s, but it can be easily...