Hobby diy
Peak indicator circuit schematic TLC272
This peak indicator circuit signals thru 2 led’s the exceeding of a pre-estabilished value of any stereo audio channel.
Signals from the 2 channels are rectified (monoalternance) with D1 and D2 and the resulted voltage is applied on OA IC TLC272 inversor entries.
The peak indicator circuit can be used up to 20kHz frequency and the current [...]
Sound Generator - Jet engine aircraft
This is a simple sound generator to produce jet engine aircraft sounds and it will run on any battery voltage between 3v and 40v.
The circuit will produce 4 sounds : low speed sound of aircraft, high speed sound of aircraft, missile and machine gun. They are activated by connecting pins 12, 13, 14 or 15 [...]
Voice, sound recorder circuit schematic
ISD1012, ISD1016 and ISD1020 are produced by ISD and allow sound voice recording and play-back. The last 2 digits show the maximum legth of recording time in seconds. This circuits contains a non-volatile memory which can memorise sound or voice without power supply up to 10 years. The circuit contains a microphone amplifier and a [...]
