Hearing aid amplifier (T1580E)

This circuit is from a 1947 Radio Electronics. The 4-tube circuit is battery powered and uses a crystal phone.

| Clique na imagem para ampliar |

Drive Loads Up to 300 mA LM3900 (CB14222E)
The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We...
3W amplifier (CB8163E)
This circuit was obtained in a 1969 Mullard manual. The transistors are from that time. The input...
Hearing and Motion Sensor Platform
August 2017 - STMicroelectronics' BlueCoin development environment is available at Mouser...