This telephone-amplifier can be used either as an independent amplifier with loudspeaker, for instance to follow a telephone-conversation, or one can connect it's output to an amplifier or a mixing-panel (e.g. radio-stations).
Technical Specifications:
� Input : separation-transformer coupling.
� Output :
� loudspeaker:0.5W/8 Ohm
� line: 0dB (0.775VRMS)
� Power supply: 7 to 9 VAC or 9 to 12 VDC (*) max. 50mA.
� (*) For building it into the mixing-panel, the possibility to connect the module to 15V exists as well.
Parts List:
| Label | Reference | Qty | Description |
| C1 | 1J0J | 1 | ELCO PCB 1�F-50V |
| C1,C2 | 1MK22 | 2 | MKH 0.022�F-400V |
| C10 | 470J0C | 1 | ELCO PCB 470�F-16V |
| C3 | C18N0 | 1 | 18nF CERAMIC CAPACITOR |
| C4,C5 | C47N0 | 2 | 47nF CERAMIC CAPACITOR |
| C6 | SI100N0 | 1 | SIBATIT 100nF-63V |
| C8 | 47J0C | 1 | ELCO PCB 47�F-16V |
| C9 | 100J0C | 1 | ELCO PCB 100�F-16V |
| D1, D2 | 1N4148 | 2 | 1N4148 (1N914) |
| D3, D4 | 1N4007 | 2 | 1N4007 DIODE 1A-1000V |
| IC1 | LM386 | 1 | LM386 AUDIO AMPLIFIER IC |
| R1...R3 | RA10K0 | 3 | RESISTOR 1/4W 10K |
| R4, R5 | RA1K0 | 2 | RESISTOR 1/4W 1K |
| R6 | RA10E0 | 1 | RESISTOR 1/4W 10E |
| R7 | RA3K3 | 1 | RESISTOR 1/4W 3K3 |
| R8 | RA560E0 | 1 | RESISTOR 1/4W 560E |
| RV1 | K010LV | 1 | PIHER TRIM 10K LARGE VERT |
| TRANSFO | LT44 | 1 | LT44 IMPEDANCETRANSFO 20KPRIM/1K SEC |
| 8P | 8P | 1 | 8P DIL IC SOCKET 300MIL |
| AXE | AXE | 1 | AXE 19mm FOR PIHER PT15 |
| DBL | DBL | 1 | JUMPER |
| H4900 | H4900 | 1 | MANUAL |
| P4900 | P4900 | 1 | PCB |
| PRINTPZ | PRINTPZ | 1 | 10 PCB TABS |
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