Amplifier Circuit DiagramsAudio Circuit DiagramsAutomotive Circuit Diagrams


The position of the materials is indicated on the print.

ISD1760 (60sec), ISD1790 (90 sec), and ISD17120 (120 sec)
1N 4007
7805 3 pcs led bulbs
1 pcs capacitive microphone
3 pcs 1K 1Part 82K 3 pcs 4.7K 2Pcs
7Pack 100nF 2Pcs 4,7mF 1Pcs: 470mF
Record sw push-and-drop switch
4pcs push button aux in one pcs jack for connector
(Recording: yellow, busy: green, power: red led)

When I first did this circuit, it had become a bit crazed. As shown bast Then I edited again. One of our brothers pushed this form in this way and even sold quite a bit in the market.

Now an electronics developer has developed a new version, they are selling, selling. I said to share my old drawing. after all, there is a new one.

If you say the new one, the only difference is a sound output integrated on the supplement was added, that’s all. The volume of this circuit is not low. quite enough. It gives up the sound you hear from a mobile radio. Of course you can add output.

in the appendix there is a proteus ares drawing. The failure of the circuit to work was made at least a thousand. do not short the HP leads.


This circuit has a 60 second recording time and there is an audio output on it. For professional use, you can output from the aux out output to an amplifier of your choice.

You can record a fine sound with the included condenser microphone and record the jumper position in the circuit from ”Mıc red to iniz Aux ece and register the aux in. You can save this entry by applying direct sound from devices such as dvd, vcd, phone radio, mp4, Pc. As a speaker, you can use a loudspeaker of 0.5W 4-16 ohms.

Our supply voltage is at least 5 volts. You can supply 12 volts. Since 5 volts are regulated in our circuit, voltage increases and decreases do not affect the operation. When we give energy to our circuit, our power led will light up and let us know that our circuit is ready for operation.


To record, you must press the rec / play switch and see if the recording led is lit. If the recording led is on, this indicates that the circuit is currently being recorded. In the meantime you should look at the busy led. Because the busy led lamp translates all the movements of our website into us. For example, when our record key is pressed, it means that there is empty space for recording. When this light goes out, the record is full. You can stop recording by pressing the record sw switch again to end recording.

PLAY: Press the Play button to listen to our record. During this time, the busy led will blink and turn off when the sound is muted.

SOUND SETTING: You can also adjust the volume with the volume button. Pressing each button will increase the 4 levels of sound and then press it again for the 5th time. Then again every time we press.


If we notice the first press of the Delete button, the busy led lamp flashes twice and is ready for deletion. If we continue to press without lifting our hands, the busy led will go on and off 7 times in total and will erase the whole of our integration. This deletion cannot be undone.


The forward button is the forward button. If you press the record key and close before the time expires, you can add a record later. When you press the register key again, the recording you made will be placed in second place. And then you make a third record. Here you can choose between the “forward” button. Every time we press, the next record goes to the queue. And when we press play button it plays. If we hold down for a long time we will reach the most recent record and when we press the plaque, our first record will be heard from the speaker.


Related Articles

Leave a Reply

Your email address will not be published.

Back to top button