Telephone Recorder R1 – 270K R2 – 1k5 R3 – 68k R4 – 33k C1- 0.22uf 150V Q1,Q2 – 2N4954 NPN D1 – 1N645 MISC – Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug

Download schema pcb Pony programmer Download schema pcb for 16F84, 12C50x, 24Cxx i SDE2506 Download schema pcb for 16F84, 12C50x i 24Cxx

ESR Meter complet project click here

Download schematic with pcb design

This design uses only two resistors to program any IIC serial eprom. It is connected to a PC serial port. I’ve succesfully built it for a 24C16 part, but it should work with both smaller and bigger chips (24C02 24C08 24C32 24C65 etc.). It is driven by the Claudio Lanconelli’s PONY PROG free windows software. [...]

C1 – 47uF 10V C2 – 0.1uF D1, D2 i D3 – Zener 4.7V D4 – LED D5, D6 i D7 – Diodos 1N4148 R1 i R2 – 4K7 ohm R3 – 390 ohm

Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful [...]

PLEASE READ THIS BEFORE YOU START CONSTRUCTION To cater for those who wish to use 4 ohm speakers with this amplifier the Kit includes the necessary components for both versions. The components that differ are R3,4,17 and 23. If you build the 8 ohm version then you must also include in the circuit R28 and [...]

Small Fm Transmitter