Geekhouse - M1BXF
  • Home

PICAXE-08M Sequencer

My 2m station includes a masthead preamp, a 600w linear and the IC-910.  In order not to blow up the preamp I needed to get a sequencer, me being me I decided to design and build one, total cost with the box was around £10.  This is a very simple design and uses a PICAXE-08M for the control as it supports 5 input/outputs.  All I needed was 1 input (PTT) and 3 outputs, preamp, TX Amp and radio.  The preamp, TX Amp and radio outputs are driven by a relay so can be configured for NO or NC in hardware or this can be done in software too.  The delay on TX is 100ms between the preamp going off and the TX amp coming on and then a further 50ms for the radio to move into TX.  On un-keying the radio is moved into RX, 50ms later the TX amp is removed then 100ms later the preamp comes back on.  There are 4 LEDs, a green one for power, one red/green for TX/RX, a green one to indicate preamp on/off and a red one for indicating the TX has come on.


Updated to v1.2

I've done some updates to the design.  The main one was adding a potentiometer to allow manual adjustment of the timing sequence.  At the moment the single potentiometer is used to add an additional delay to the default value allow a sequence delay of between 100ms to about 1 second.

I also cleaned the code up, adding comments and symbols, to allow whoever builds it to customise the outputs in and better understand the code if they are new to PICAXE.

NOTE: If this design is to be used with a radio which goes into transmit when the PTT line is grounded then you can omit D3 and REL3 and connect the PTT line of the radio directly to the collector of Q3.

Downloads

v1.2

ExpressPCB Schematic and PCB layout v1.2 (ZIP)
File Size: 32 kb
File Type: zip
Download File

Schematic Layout v1.2 (BMP)
File Size: 412 kb
File Type: bmp
Download File

PICAXE Code v1.2 (BAS)
File Size: 3 kb
File Type: bas
Download File

v1.0

ExpressPCB Schematic and PCB layout v1.0 (ZIP)
File Size: 32 kb
File Type: zip
Download File

Schematic Layout v1.0 (BMP)
File Size: 412 kb
File Type: bmp
Download File

PICAXE Code v1.0 (BAS)
File Size: 2 kb
File Type: bas
Download File

Powered by Create your own unique website with customizable templates.